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Kotlin-based LeetCode algorithm problem solutions, regularly updated.

leetcode-in-kotlin.github.io

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MIT license

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src/main/kotlin		src/main/kotlin
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README.md		README.md

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"For coding interview preparation, LeetCode is one of the best online resource providing a rich library of more than 300 real coding interview questions for you to practice from using one of the 7 supported languages - C, C++, Java, Python, C#, JavaScript, Ruby."

Binary Search II

Day 1


0209	Minimum Size Subarray Sum	Medium	Array, Binary_Search, Prefix_Sum, Sliding_Window	315	96.73

Day 2

Day 3


0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search	318	82.28

Day 4

Day 5


0287	Find the Duplicate Number	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Two_Pointers, Bit_Manipulation	656	66.21

Day 6

Day 7

Day 8


0240	Search a 2D Matrix II	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer	460	66.08
0275	H-Index II	Medium	Array, Binary_Search	398	81.82

Day 9

Day 10


0222	Count Complete Tree Nodes

Day 11

Day 12


0081	Search in Rotated Sorted Array II	Medium	Array, Binary_Search	352	42.31
0162	Find Peak Element	Medium	Top_Interview_Questions, Array, Binary_Search	297	53.85

Day 13


0154	Find Minimum in Rotated Sorted Array II	Hard	Array, Binary_Search	275	84.00

Day 14

Day 15

Day 16

Day 17

Day 18

Day 19

Day 20

Dynamic Programming I

Day 1

Day 2


0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization	127	97.06

Day 3


0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	156	92.24
0213	House Robber II	Medium	Array, Dynamic_Programming	257	59.62

Day 4


0055	Jump Game	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy	670	66.67
0045	Jump Game II	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy	227	98.14

Day 5


0053	Maximum Subarray	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer	662	82.48

Day 6


0152	Maximum Product Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	253	88.42

Day 7


0121	Best Time to Buy and Sell Stock	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	609	94.06
0122	Best Time to Buy and Sell Stock II	Medium	Top_Interview_Questions, Array, Dynamic_Programming, Greedy	370	16.98

Day 8


0309	Best Time to Buy and Sell Stock with Cooldown	Medium	Array, Dynamic_Programming	272	73.33

Day 9


0139	Word Break	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization	197	87.17
0042	Trapping Rain Water	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack	196	100.00

Day 10


0091	Decode Ways	Medium	Top_Interview_Questions, String, Dynamic_Programming	237	76.88

Day 11


0264	Ugly Number II	Medium	Hash_Table, Dynamic_Programming, Math, Heap_Priority_Queue	182	95.45
0096	Unique Binary Search Trees	Medium	Top_100_Liked_Questions, Dynamic_Programming, Math, Tree, Binary_Tree, Binary_Search_Tree	147	88.52

Day 12


0118	Pascal's Triangle	Easy	Top_Interview_Questions, Array, Dynamic_Programming	277	33.22
0119	Pascal's Triangle II	Easy	Array, Dynamic_Programming	296	19.15

Day 13


0120	Triangle	Medium	Array, Dynamic_Programming	194	97.87

Day 14


0304	Range Sum Query 2D - Immutable	Medium	Array, Matrix, Design, Prefix_Sum	1373	85.71

Day 15


0062	Unique Paths	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics	209	49.18
0063	Unique Paths II	Medium	Array, Dynamic_Programming, Matrix	187	84.62

Day 16


0064	Minimum Path Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix	222	95.70
0221	Maximal Square	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix	614	44.00

Day 17


0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming	323	75.48

Day 18


0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search	318	82.28

Day 19


1143	Longest Common Subsequence	Medium	Top_100_Liked_Questions, String, Dynamic_Programming	307	38.36
0072	Edit Distance	Hard	Top_100_Liked_Questions, String, Dynamic_Programming	320	63.53

Day 20


0322	Coin Change	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search	332	50.68

Day 21


0343	Integer Break	Medium	Dynamic_Programming, Math	218	63.89
0279	Perfect Squares	Medium	Top_Interview_Questions, Dynamic_Programming, Math, Breadth_First_Search	176	98.80

Programming Skills I

Day 1 Basic Data Type

Day 2 Operator


0191	Number of 1 Bits	Easy	Top_Interview_Questions, Bit_Manipulation	237	68.44

Day 3 Conditional Statements

Day 4 Loop


0202	Happy Number	Easy	Top_Interview_Questions, Hash_Table, Math, Two_Pointers	261	45.08

Day 5 Function

Day 6 Array


0283	Move Zeroes	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Two_Pointers	516	79.07

Day 7 Array

Day 8 String

Day 9 String

Day 10 Linked List and Tree


0104	Maximum Depth of Binary Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	236	83.39

Day 11 Containers and Libraries


0232	Implement Queue using Stacks	Easy	Stack, Design, Queue	258	70.86
0242	Valid Anagram	Easy	Top_Interview_Questions, String, Hash_Table, Sorting	251	87.65
0217	Contains Duplicate	Easy	Top_Interview_Questions, Array, Hash_Table, Sorting	719	73.49

Day 12 Class and Object


0303	Range Sum Query - Immutable	Easy	Array, Design, Prefix_Sum	472	63.64

Programming Skills II

Day 1


0028	Find the Index of the First Occurrence in a String	Easy	Top_Interview_Questions, String, Two_Pointers, String_Matching	257	32.35

Day 2


0110	Balanced Binary Tree	Easy	Depth_First_Search, Tree, Binary_Tree	310	63.63

Day 3


0150	Evaluate Reverse Polish Notation	Medium	Top_Interview_Questions, Array, Math, Stack	233	88.82
0066	Plus One	Easy	Top_Interview_Questions, Array, Math	303	35.18

Day 4


0043	Multiply Strings	Medium	String, Math, Simulation	390	56.25

Day 5


0067	Add Binary	Easy	String, Math, Bit_Manipulation, Simulation	327	32.67

Day 6


0739	Daily Temperatures	Medium	Top_100_Liked_Questions, Array, Stack, Monotonic_Stack	936	80.54
0058	Length of Last Word	Easy	String	243	63.33

Day 7


0048	Rotate Image	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix	287	46.50

Day 8


0054	Spiral Matrix	Medium	Top_Interview_Questions, Array, Matrix, Simulation	224	62.50

Day 9

Day 10

Day 11


0049	Group Anagrams	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting	506	86.55

Day 12


0438	Find All Anagrams in a String	Medium	Top_100_Liked_Questions, String, Hash_Table, Sliding_Window	561	54.68

Day 13


0304	Range Sum Query 2D - Immutable	Medium	Array, Matrix, Design, Prefix_Sum	1373	85.71

Day 14


0143	Reorder List	Medium	Two_Pointers, Stack, Linked_List, Recursion	395	82.26
0138	Copy List with Random Pointer	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List	274	80.58

Day 15


0002	Add Two Numbers	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion	417	50.44

Day 16


0061	Rotate List	Medium	Two_Pointers, Linked_List	193	92.16
0173	Binary Search Tree Iterator	Medium	Tree, Binary_Tree, Stack, Design, Binary_Search_Tree, Iterator	563	46.91

Day 17

Day 18


0155	Min Stack	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design	331	84.88

Day 19

Day 20

Graph Theory I

Day 1 Matrix Related Problems


0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	252	95.41

Day 2 Matrix Related Problems

Day 3 Matrix Related Problems

Day 4 Matrix Related Problems

Day 5 Matrix Related Problems

Day 6 Matrix Related Problems

Day 7 Standard Traversal

Day 8 Standard Traversal

Day 9 Standard Traversal

Day 10 Standard Traversal

Day 11 Breadth First Search


0365	Water and Jug Problem	Medium	Math, Depth_First_Search, Breadth_First_Search	130	100.00

Day 12 Breadth First Search


0127	Word Ladder	Hard	Top_Interview_Questions, String, Hash_Table, Breadth_First_Search	396	98.68

Day 13 Graph Theory

Day 14 Graph Theory

SQL I

Day 1 Select


0183	Customers Who Never Order	Easy	Database	712	33.67

Day 2 Select and Order


0196	Delete Duplicate Emails	Easy	Database	593	94.17

Day 3 String Processing Functions

Day 4 Union and Select


0176	Second Highest Salary	Medium	Database	219	92.54

Day 5 Union


0175	Combine Two Tables	Easy	Database	473	54.97

Day 6 Union


0197	Rising Temperature	Easy	Database	394	94.15

Day 7 Function

Day 8 Function

Day 9 Control of Flow

Day 10 Where


0182	Duplicate Emails	Easy	Database	396	68.40

Level 1

Day 1 Prefix Sum

Day 2 String


0205	Isomorphic Strings	Easy	String, Hash_Table	278	79.96

Day 3 Linked List


0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion	176	96.25
0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion	279	45.78

Day 4 Linked List


0142	Linked List Cycle II	Medium	Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List	192	63.39

Day 5 Greedy


0121	Best Time to Buy and Sell Stock	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	609	94.06

Day 6 Tree


0102	Binary Tree Level Order Traversal	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree	355	29.37

Day 7 Binary Search


0278	First Bad Version	Easy	Binary_Search, Interactive	349	76.86

Day 8 Binary Search Tree


0098	Validate Binary Search Tree	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	330	41.38
0235	Lowest Common Ancestor of a Binary Search Tree	Easy	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	404	75.59

Day 9 Graph/BFS/DFS


0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	252	95.41

Day 10 Dynamic Programming


0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization	127	97.06

Day 11 Dynamic Programming


0062	Unique Paths	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics	209	49.18

Day 12 Sliding Window/Two Pointer


0438	Find All Anagrams in a String	Medium	Top_100_Liked_Questions, String, Hash_Table, Sliding_Window	561	54.68

Day 13 Hashmap


0001	Two Sum	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table	234	92.75
0299	Bulls and Cows	Medium	String, Hash_Table, Counting	254	84.82

Day 14 Stack


0394	Decode String	Medium	Top_100_Liked_Questions, String, Stack, Recursion	224	64.86

Day 15 Heap

Level 2

Day 1 Implementation/Simulation


0202	Happy Number	Easy	Top_Interview_Questions, Hash_Table, Math, Two_Pointers	261	45.08
0054	Spiral Matrix	Medium	Top_Interview_Questions, Array, Matrix, Simulation	224	62.50

Day 2 String


0014	Longest Common Prefix	Easy	Top_Interview_Questions, String	209	88.86
0043	Multiply Strings	Medium	String, Math, Simulation	390	56.25

Day 3 Linked List


0019	Remove Nth Node From End of List	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List	180	91.58
0234	Palindrome Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Stack, Linked_List, Recursion	641	79.53

Day 4 Linked List


0328	Odd Even Linked List	Medium	Top_Interview_Questions, Linked_List	216	86.96
0148	Sort List	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Linked_List, Divide_and_Conquer, Merge_Sort	820	61.70

Day 5 Greedy

Day 6 Tree


0226	Invert Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	233	54.90
0110	Balanced Binary Tree	Easy	Depth_First_Search, Tree, Binary_Tree	310	63.63

Day 7 Tree


0543	Diameter of Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree	307	43.93
0437	Path Sum III	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree	403	54.12

Day 8 Binary Search


0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix	290	40.17
0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search	184	86.08

Day 9 Binary Search Tree


0108	Convert Sorted Array to Binary Search Tree	Easy	Top_Interview_Questions, Array, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer	334	35.39
0230	Kth Smallest Element in a BST	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	393	33.33
0173	Binary Search Tree Iterator	Medium	Tree, Binary_Tree, Stack, Design, Binary_Search_Tree, Iterator	563	46.91

Day 10 Graph/BFS/DFS


0994	Rotting Oranges	Medium	Array, Breadth_First_Search, Matrix	308	57.93

Day 11 Graph/BFS/DFS


0210	Course Schedule II	Medium	Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort	266	96.32

Day 12 Dynamic Programming


0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	156	92.24
0322	Coin Change	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search	332	50.68

Day 13 Dynamic Programming


0416	Partition Equal Subset Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming	509	57.56
0152	Maximum Product Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	253	88.42

Day 14 Sliding Window/Two Pointer


0003	Longest Substring Without Repeating Characters	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window	258	91.09
0016	3Sum Closest	Medium	Array, Sorting, Two_Pointers	413	95.05
0076	Minimum Window Substring	Hard	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window	346	85.20

Day 15 Tree


0100	Same Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	208	72.24
0101	Symmetric Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	290	26.98
0199	Binary Tree Right Side View	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	194	92.89

Day 16 Design


0232	Implement Queue using Stacks	Easy	Stack, Design, Queue	258	70.86
0155	Min Stack	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design	331	84.88
0208	Implement Trie (Prefix Tree)	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie	689	61.00

Day 17 Interval


0057	Insert Interval	Medium	Array	257	99.52
0056	Merge Intervals	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting	323	99.68

Day 18 Stack


0227	Basic Calculator II	Medium	Top_Interview_Questions, String, Math, Stack	383	62.50

Day 19 Union Find

Day 20 Brute Force/Backtracking


0039	Combination Sum	Medium	Top_100_Liked_Questions, Array, Backtracking	317	86.85
0046	Permutations	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking	186	100.00

Udemy

Udemy Integers


0136	Single Number	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation	344	83.63
0007	Reverse Integer	Medium	Top_Interview_Questions, Math	245	60.32
0009	Palindrome Number	Easy	Math	238	96.24
0172	Factorial Trailing Zeroes	Medium	Top_Interview_Questions, Math	220	67.65
0050	Pow(x, n)	Medium	Top_Interview_Questions, Math, Recursion	264	52.98

Udemy Strings


0344	Reverse String	Easy	Top_Interview_Questions, String, Two_Pointers, Recursion	445	69.75
0014	Longest Common Prefix	Easy	Top_Interview_Questions, String	209	88.86
0187	Repeated DNA Sequences	Medium	String, Hash_Table, Bit_Manipulation, Sliding_Window, Hash_Function, Rolling_Hash	319	79.03
0003	Longest Substring Without Repeating Characters	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window	258	91.09
0020	Valid Parentheses	Easy	Top_100_Liked_Questions, Top_Interview_Questions, String, Stack	226	72.53
0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming	323	75.48
0394	Decode String	Medium	Top_100_Liked_Questions, String, Stack, Recursion	224	64.86
0242	Valid Anagram	Easy	Top_Interview_Questions, String, Hash_Table, Sorting	251	87.65
0049	Group Anagrams	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting	506	86.55
0151	Reverse Words in a String	Medium	String, Two_Pointers	206	98.90
0273	Integer to English Words	Hard	String, Math, Recursion	273	82.93

Udemy Binary Search


0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search	184	86.08
0153	Find Minimum in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Array, Binary_Search	262	60.96

Udemy Arrays


0121	Best Time to Buy and Sell Stock	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	609	94.06
0283	Move Zeroes	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Two_Pointers	516	79.07
0001	Two Sum	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table	234	92.75
0217	Contains Duplicate	Easy	Top_Interview_Questions, Array, Hash_Table, Sorting	719	73.49
0058	Length of Last Word	Easy	String	243	63.33
0122	Best Time to Buy and Sell Stock II	Medium	Top_Interview_Questions, Array, Dynamic_Programming, Greedy	370	16.98
0080	Remove Duplicates from Sorted Array II	Medium	Array, Two_Pointers	357	44.78
0189	Rotate Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers	483	86.95
0055	Jump Game	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy	670	66.67
0075	Sort Colors	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers	198	85.66
0066	Plus One	Easy	Top_Interview_Questions, Array, Math	303	35.18
0238	Product of Array Except Self	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Prefix_Sum	669	48.96
0041	First Missing Positive	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table	345	100.00
0239	Sliding Window Maximum	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue	1059	86.14

Udemy Two Pointers


0125	Valid Palindrome	Easy	Top_Interview_Questions, String, Two_Pointers	353	52.06
0026	Remove Duplicates from Sorted Array	Easy	Top_Interview_Questions, Array, Two_Pointers	361	77.19
0042	Trapping Rain Water	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack	196	100.00
0015	3Sum	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers	761	90.55

Udemy Famous Algorithm


0053	Maximum Subarray	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer	662	82.48
0169	Majority Element	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer	460	51.25

Udemy Sorting Algorithms

Udemy 2D Arrays/Matrix


0304	Range Sum Query 2D - Immutable	Medium	Array, Matrix, Design, Prefix_Sum	1373	85.71
0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix	290	40.17
0054	Spiral Matrix	Medium	Top_Interview_Questions, Array, Matrix, Simulation	224	62.50
0048	Rotate Image	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix	287	46.50
0073	Set Matrix Zeroes	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Matrix	255	100.00
0056	Merge Intervals	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting	323	99.68

Udemy Linked List


0114	Flatten Binary Tree to Linked List	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Linked_List	191	93.10
0328	Odd Even Linked List	Medium	Top_Interview_Questions, Linked_List	216	86.96
0061	Rotate List	Medium	Two_Pointers, Linked_List	193	92.16
0024	Swap Nodes in Pairs	Medium	Top_100_Liked_Questions, Linked_List, Recursion	149	99.39
0142	Linked List Cycle II	Medium	Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List	192	63.39
0141	Linked List Cycle	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List	223	91.85
0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion	279	45.78
0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion	176	96.25
0160	Intersection of Two Linked Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List	262	83.50
0234	Palindrome Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Stack, Linked_List, Recursion	641	79.53
0138	Copy List with Random Pointer	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List	274	80.58
0025	Reverse Nodes in k-Group	Hard	Top_100_Liked_Questions, Linked_List, Recursion	194	87.72
0146	LRU Cache	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Design, Linked_List, Doubly_Linked_List	1116	97.93

Udemy Tree Stack Queue


0144	Binary Tree Preorder Traversal	Easy	Depth_First_Search, Tree, Binary_Tree, Stack	277	37.90
0094	Binary Tree Inorder Traversal	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack	269	38.80
0145	Binary Tree Postorder Traversal	Easy	Depth_First_Search, Tree, Binary_Tree, Stack	211	80.00
0102	Binary Tree Level Order Traversal	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree	355	29.37
0103	Binary Tree Zigzag Level Order Traversal	Medium	Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree	316	34.25
0108	Convert Sorted Array to Binary Search Tree	Easy	Top_Interview_Questions, Array, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer	334	35.39
0543	Diameter of Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree	307	43.93
0100	Same Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	208	72.24
0226	Invert Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	233	54.90
0111	Minimum Depth of Binary Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	525	90.51
0104	Maximum Depth of Binary Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	236	83.39
0110	Balanced Binary Tree	Easy	Depth_First_Search, Tree, Binary_Tree	310	63.63
0297	Serialize and Deserialize Binary Tree	Hard	Top_Interview_Questions, String, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design	475	78.85
0124	Binary Tree Maximum Path Sum	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree	331	74.42
0098	Validate Binary Search Tree	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	330	41.38
0337	House Robber III	Medium	Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree	282	84.62
0236	Lowest Common Ancestor of a Binary Tree	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree	386	45.21

Udemy Trie and Heap


0208	Implement Trie (Prefix Tree)	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie	689	61.00

Udemy Graph


0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	252	95.41
0133	Clone Graph	Medium	Hash_Table, Depth_First_Search, Breadth_First_Search, Graph	351	60.91

Udemy Dynamic Programming


0120	Triangle	Medium	Array, Dynamic_Programming	194	97.87
0118	Pascal's Triangle	Easy	Top_Interview_Questions, Array, Dynamic_Programming	277	33.22
0119	Pascal's Triangle II	Easy	Array, Dynamic_Programming	296	19.15
0139	Word Break	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization	197	87.17
0152	Maximum Product Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	253	88.42
0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	156	92.24
0213	House Robber II	Medium	Array, Dynamic_Programming	257	59.62
0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization	127	97.06
0064	Minimum Path Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix	222	95.70
0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search	318	82.28
1143	Longest Common Subsequence	Medium	Top_100_Liked_Questions, String, Dynamic_Programming	307	38.36
0072	Edit Distance	Hard	Top_100_Liked_Questions, String, Dynamic_Programming	320	63.53
0044	Wildcard Matching	Hard	Top_Interview_Questions, String, Dynamic_Programming, Greedy, Recursion	401	86.11
0010	Regular Expression Matching	Hard	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Recursion	292	58.58

Udemy Backtracking/Recursion


0022	Generate Parentheses	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking	210	78.51
0039	Combination Sum	Medium	Top_100_Liked_Questions, Array, Backtracking	317	86.85
0216	Combination Sum III	Medium	Array, Backtracking	175	90.91
0078	Subsets	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking	353	30.14
0017	Letter Combinations of a Phone Number	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking	262	73.59
0046	Permutations	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking	186	100.00

Udemy Bit Manipulation


0191	Number of 1 Bits	Easy	Top_Interview_Questions, Bit_Manipulation	237	68.44
0190	Reverse Bits	Easy	Top_Interview_Questions, Bit_Manipulation, Divide_and_Conquer	198	81.82
0338	Counting Bits	Easy	Top_100_Liked_Questions, Dynamic_Programming, Bit_Manipulation	186	99.26
0029	Divide Two Integers	Medium	Top_Interview_Questions, Math, Bit_Manipulation	281	31.67

Udemy Design


0155	Min Stack	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design	331	84.88

Data Structure I

Day 1 Array


0217	Contains Duplicate	Easy	Top_Interview_Questions, Array, Hash_Table, Sorting	719	73.49
0053	Maximum Subarray	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer	662	82.48

Day 2 Array


0001	Two Sum	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table	234	92.75
0088	Merge Sorted Array	Easy	Top_Interview_Questions, Array, Sorting, Two_Pointers	311	33.40

Day 3 Array


0350	Intersection of Two Arrays II	Easy	Top_Interview_Questions, Array, Hash_Table, Sorting, Binary_Search, Two_Pointers	321	73.37
0121	Best Time to Buy and Sell Stock	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	609	94.06

Day 4 Array


0118	Pascal's Triangle	Easy	Top_Interview_Questions, Array, Dynamic_Programming	277	33.22

Day 5 Array


0036	Valid Sudoku	Medium	Top_Interview_Questions, Array, Hash_Table, Matrix	346	65.03
0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix	290	40.17

Day 6 String


0242	Valid Anagram	Easy	Top_Interview_Questions, String, Hash_Table, Sorting	251	87.65

Day 7 Linked List


0141	Linked List Cycle	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List	223	91.85
0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion	176	96.25
0203	Remove Linked List Elements	Easy	Linked_List, Recursion	233	91.22

Day 8 Linked List


0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion	279	45.78
0083	Remove Duplicates from Sorted List	Easy	Linked_List	274	77.82

Day 9 Stack Queue


0020	Valid Parentheses	Easy	Top_100_Liked_Questions, Top_Interview_Questions, String, Stack	226	72.53
0232	Implement Queue using Stacks	Easy	Stack, Design, Queue	258	70.86

Day 10 Tree


0144	Binary Tree Preorder Traversal	Easy	Depth_First_Search, Tree, Binary_Tree, Stack	277	37.90
0094	Binary Tree Inorder Traversal	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack	269	38.80
0145	Binary Tree Postorder Traversal	Easy	Depth_First_Search, Tree, Binary_Tree, Stack	211	80.00

Day 11 Tree


0102	Binary Tree Level Order Traversal	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree	355	29.37
0104	Maximum Depth of Binary Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	236	83.39
0101	Symmetric Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	290	26.98

Day 12 Tree


0226	Invert Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	233	54.90
0112	Path Sum	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	322	36.41

Day 13 Tree

Day 14 Tree


0098	Validate Binary Search Tree	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	330	41.38
0235	Lowest Common Ancestor of a Binary Search Tree	Easy	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	404	75.59

Data Structure II

Day 1 Array


0136	Single Number	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation	344	83.63
0169	Majority Element	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer	460	51.25
0015	3Sum	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers	761	90.55

Day 2 Array


0075	Sort Colors	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers	198	85.66
0056	Merge Intervals	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting	323	99.68

Day 3 Array


0119	Pascal's Triangle II	Easy	Array, Dynamic_Programming	296	19.15
0048	Rotate Image	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix	287	46.50
0059	Spiral Matrix II	Medium	Array, Matrix, Simulation	153	100.00

Day 4 Array


0240	Search a 2D Matrix II	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer	460	66.08

Day 5 Array


0334	Increasing Triplet Subsequence	Medium	Top_Interview_Questions, Array, Greedy	672	60.61
0238	Product of Array Except Self	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Prefix_Sum	669	48.96
0560	Subarray Sum Equals K	Medium	Top_100_Liked_Questions, Array, Hash_Table, Prefix_Sum	692	53.27

Day 6 String

Day 7 String


0290	Word Pattern	Easy	String, Hash_Table	177	89.55
0763	Partition Labels	Medium	Top_100_Liked_Questions, String, Hash_Table, Greedy, Two_Pointers	235	84.75

Day 8 String


0049	Group Anagrams	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting	506	86.55
0043	Multiply Strings	Medium	String, Math, Simulation	390	56.25

Day 9 String


0187	Repeated DNA Sequences	Medium	String, Hash_Table, Bit_Manipulation, Sliding_Window, Hash_Function, Rolling_Hash	319	79.03
0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming	323	75.48

Day 10 Linked List


0002	Add Two Numbers	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion	417	50.44
0142	Linked List Cycle II	Medium	Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List	192	63.39

Day 11 Linked List


0160	Intersection of Two Linked Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List	262	83.50
0082	Remove Duplicates from Sorted List II	Medium	Two_Pointers, Linked_List	241	91.04

Day 12 Linked List


0024	Swap Nodes in Pairs	Medium	Top_100_Liked_Questions, Linked_List, Recursion	149	99.39

Day 13 Linked List


0025	Reverse Nodes in k-Group	Hard	Top_100_Liked_Questions, Linked_List, Recursion	194	87.72
0143	Reorder List	Medium	Two_Pointers, Stack, Linked_List, Recursion	395	82.26

Day 14 Stack Queue


0155	Min Stack	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design	331	84.88

Day 15 Tree


0108	Convert Sorted Array to Binary Search Tree	Easy	Top_Interview_Questions, Array, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer	334	35.39
0105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer	370	58.31
0103	Binary Tree Zigzag Level Order Traversal	Medium	Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree	316	34.25

Day 16 Tree


0199	Binary Tree Right Side View	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	194	92.89
0113	Path Sum II	Medium	Depth_First_Search, Tree, Binary_Tree, Backtracking	364	78.67

Day 17 Tree


0230	Kth Smallest Element in a BST	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	393	33.33
0173	Binary Search Tree Iterator	Medium	Tree, Binary_Tree, Stack, Design, Binary_Search_Tree, Iterator	563	46.91

Day 18 Tree


0236	Lowest Common Ancestor of a Binary Tree	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree	386	45.21
0297	Serialize and Deserialize Binary Tree	Hard	Top_Interview_Questions, String, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design	475	78.85

Day 19 Graph

Day 20 Heap Priority Queue


0215	Kth Largest Element in an Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect	839	34.43
0347	Top K Frequent Elements	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Divide_and_Conquer, Quickselect, Bucket_Sort	268	99.74

Day 21 Heap Priority Queue

Algorithm I

Day 1 Binary Search


0278	First Bad Version	Easy	Binary_Search, Interactive	349	76.86
0035	Search Insert Position	Easy	Top_100_Liked_Questions, Array, Binary_Search	267	50.32

Day 2 Two Pointers


0189	Rotate Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers	483	86.95

Day 3 Two Pointers


0283	Move Zeroes	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Two_Pointers	516	79.07
0167	Two Sum II - Input Array Is Sorted	Medium	Array, Binary_Search, Two_Pointers	403	68.74

Day 4 Two Pointers


0344	Reverse String	Easy	Top_Interview_Questions, String, Two_Pointers, Recursion	445	69.75

Day 5 Two Pointers


0019	Remove Nth Node From End of List	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List	180	91.58

Day 6 Sliding Window


0003	Longest Substring Without Repeating Characters	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window	258	91.09

Day 7 Breadth First Search Depth First Search

Day 8 Breadth First Search Depth First Search


0116	Populating Next Right Pointers in Each Node	Medium	Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List	355	69.02

Day 9 Breadth First Search Depth First Search


0994	Rotting Oranges	Medium	Array, Breadth_First_Search, Matrix	308	57.93

Day 10 Recursion Backtracking


0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion	176	96.25
0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion	279	45.78

Day 11 Recursion Backtracking


0077	Combinations	Medium	Backtracking	244	100.00
0046	Permutations	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking	186	100.00

Day 12 Dynamic Programming


0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization	127	97.06
0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	156	92.24
0120	Triangle	Medium	Array, Dynamic_Programming	194	97.87

Day 13 Bit Manipulation


0231	Power of Two	Easy	Math, Bit_Manipulation, Recursion	161	86.81
0191	Number of 1 Bits	Easy	Top_Interview_Questions, Bit_Manipulation	237	68.44

Day 14 Bit Manipulation


0190	Reverse Bits	Easy	Top_Interview_Questions, Bit_Manipulation, Divide_and_Conquer	198	81.82
0136	Single Number	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation	344	83.63

Algorithm II

Day 1 Binary Search


0034	Find First and Last Position of Element in Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search	228	83.38
0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search	184	86.08
0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix	290	40.17

Day 2 Binary Search


0153	Find Minimum in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Array, Binary_Search	262	60.96
0162	Find Peak Element	Medium	Top_Interview_Questions, Array, Binary_Search	297	53.85

Day 3 Two Pointers


0082	Remove Duplicates from Sorted List II	Medium	Two_Pointers, Linked_List	241	91.04
0015	3Sum	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers	761	90.55

Day 4 Two Pointers


0011	Container With Most Water	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers	474	89.18

Day 5 Sliding Window


0438	Find All Anagrams in a String	Medium	Top_100_Liked_Questions, String, Hash_Table, Sliding_Window	561	54.68
0209	Minimum Size Subarray Sum	Medium	Array, Binary_Search, Prefix_Sum, Sliding_Window	315	96.73

Day 6 Breadth First Search Depth First Search


0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	252	95.41

Day 7 Breadth First Search Depth First Search


0117	Populating Next Right Pointers in Each Node II	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List	199	94.67

Day 8 Breadth First Search Depth First Search


0130	Surrounded Regions	Medium	Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	355	84.42

Day 9 Recursion Backtracking


0078	Subsets	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking	353	30.14
0090	Subsets II	Medium	Array, Bit_Manipulation, Backtracking	366	58.09

Day 10 Recursion Backtracking


0047	Permutations II	Medium	Array, Backtracking	406	76.36
0039	Combination Sum	Medium	Top_100_Liked_Questions, Array, Backtracking	317	86.85
0040	Combination Sum II	Medium	Array, Backtracking	348	80.92

Day 11 Recursion Backtracking


0017	Letter Combinations of a Phone Number	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking	262	73.59
0022	Generate Parentheses	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking	210	78.51
0079	Word Search	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Backtracking	463	68.49

Day 12 Dynamic Programming


0213	House Robber II	Medium	Array, Dynamic_Programming	257	59.62
0055	Jump Game	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy	670	66.67

Day 13 Dynamic Programming


0045	Jump Game II	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy	227	98.14
0062	Unique Paths	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics	209	49.18

Day 14 Dynamic Programming


0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming	323	75.48

Day 15 Dynamic Programming


0091	Decode Ways	Medium	Top_Interview_Questions, String, Dynamic_Programming	237	76.88
0139	Word Break	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization	197	87.17

Day 16 Dynamic Programming


0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search	318	82.28

Day 17 Dynamic Programming


1143	Longest Common Subsequence	Medium	Top_100_Liked_Questions, String, Dynamic_Programming	307	38.36

Day 18 Dynamic Programming


0072	Edit Distance	Hard	Top_100_Liked_Questions, String, Dynamic_Programming	320	63.53
0322	Coin Change	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search	332	50.68
0343	Integer Break	Medium	Dynamic_Programming, Math	218	63.89

Day 19 Bit Manipulation


0201	Bitwise AND of Numbers Range	Medium	Bit_Manipulation	368	80.00

Day 20 Others

Day 21 Others


0202	Happy Number	Easy	Top_Interview_Questions, Hash_Table, Math, Two_Pointers	261	45.08
0149	Max Points on a Line	Hard	Top_Interview_Questions, Array, Hash_Table, Math, Geometry	307	83.33

Binary Search I

Day 1

Day 2


0035	Search Insert Position	Easy	Top_100_Liked_Questions, Array, Binary_Search	267	50.32

Day 3


0367	Valid Perfect Square	Easy	Math, Binary_Search	137	94.55

Day 4


0069	Sqrt(x)	Easy	Top_Interview_Questions, Math, Binary_Search	153	95.75

Day 5


0278	First Bad Version	Easy	Binary_Search, Interactive	349	76.86
0034	Find First and Last Position of Element in Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search	228	83.38

Day 6

Day 7


0167	Two Sum II - Input Array Is Sorted	Medium	Array, Binary_Search, Two_Pointers	403	68.74

Day 8


0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix	290	40.17

Day 9

Day 10


0350	Intersection of Two Arrays II	Easy	Top_Interview_Questions, Array, Hash_Table, Sorting, Binary_Search, Two_Pointers	321	73.37

Day 11


0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search	184	86.08

Day 12


0153	Find Minimum in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Array, Binary_Search	262	60.96

Algorithms

#	Title	Difficulty	Tag	Time, ms	Time, %
1143	Longest Common Subsequence	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Algorithm_II_Day_17_Dynamic_Programming, Dynamic_Programming_I_Day_19, Udemy_Dynamic_Programming	307	38.36
0994	Rotting Oranges	Medium	Array, Breadth_First_Search, Matrix, Algorithm_I_Day_9_Breadth_First_Search_Depth_First_Search, Level_2_Day_10_Graph/BFS/DFS	308	57.93
0864	Shortest Path to Get All Keys	Hard	Breadth_First_Search, Bit_Manipulation	176	100.00
0763	Partition Labels	Medium	Top_100_Liked_Questions, String, Hash_Table, Greedy, Two_Pointers, Data_Structure_II_Day_7_String	235	84.75
0739	Daily Temperatures	Medium	Top_100_Liked_Questions, Array, Stack, Monotonic_Stack, Programming_Skills_II_Day_6	936	80.54
0647	Palindromic Substrings	Medium	Top_100_Liked_Questions, String, Dynamic_Programming	266	67.83
0560	Subarray Sum Equals K	Medium	Top_100_Liked_Questions, Array, Hash_Table, Prefix_Sum, Data_Structure_II_Day_5_Array	692	53.27
0543	Diameter of Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Level_2_Day_7_Tree, Udemy_Tree_Stack_Queue	307	43.93
0494	Target Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Backtracking	308	89.61
0438	Find All Anagrams in a String	Medium	Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Programming_Skills_II_Day_12, Level_1_Day_12_Sliding_Window/Two_Pointer	561	54.68
0437	Path Sum III	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Level_2_Day_7_Tree	403	54.12
0416	Partition Equal Subset Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Level_2_Day_13_Dynamic_Programming	509	57.56
0394	Decode String	Medium	Top_100_Liked_Questions, String, Stack, Recursion, Level_1_Day_14_Stack, Udemy_Strings	224	64.86
0378	Kth Smallest Element in a Sorted Matrix	Medium	Top_Interview_Questions, Array, Sorting, Binary_Search, Matrix, Heap_Priority_Queue	522	59.78
0368	Largest Divisible Subset	Medium	Array, Dynamic_Programming, Math, Sorting	412	73.33
0367	Valid Perfect Square	Easy	Math, Binary_Search, Binary_Search_I_Day_3	137	94.55
0365	Water and Jug Problem	Medium	Math, Depth_First_Search, Breadth_First_Search, Graph_Theory_I_Day_11_Breadth_First_Search	130	100.00
0363	Max Sum of Rectangle No Larger Than K	Hard	Array, Dynamic_Programming, Binary_Search, Matrix, Ordered_Set	243	100.00
0357	Count Numbers with Unique Digits	Medium	Dynamic_Programming, Math, Backtracking	104	100.00
0355	Design Twitter	Medium	Hash_Table, Design, Heap_Priority_Queue, Linked_List	288	68.75
0354	Russian Doll Envelopes	Hard	Array, Dynamic_Programming, Sorting, Binary_Search	788	100.00
0352	Data Stream as Disjoint Intervals	Hard	Binary_Search, Design, Ordered_Set	905	75.00
0350	Intersection of Two Arrays II	Easy	Top_Interview_Questions, Array, Hash_Table, Sorting, Binary_Search, Two_Pointers, Data_Structure_I_Day_3_Array, Binary_Search_I_Day_10	321	73.37
0349	Intersection of Two Arrays	Easy	Array, Hash_Table, Sorting, Binary_Search, Two_Pointers	346	66.99
0347	Top K Frequent Elements	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Divide_and_Conquer, Quickselect, Bucket_Sort, Data_Structure_II_Day_20_Heap_Priority_Queue	268	99.74
0345	Reverse Vowels of a String	Easy	String, Two_Pointers	349	80.63
0344	Reverse String	Easy	Top_Interview_Questions, String, Two_Pointers, Recursion, Algorithm_I_Day_4_Two_Pointers, Udemy_Strings	445	69.75
0343	Integer Break	Medium	Dynamic_Programming, Math, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_21	218	63.89
0342	Power of Four	Easy	Math, Bit_Manipulation, Recursion	150	92.11
0338	Counting Bits	Easy	Top_100_Liked_Questions, Dynamic_Programming, Bit_Manipulation, Udemy_Bit_Manipulation	186	99.26
0337	House Robber III	Medium	Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Udemy_Tree_Stack_Queue	282	84.62
0336	Palindrome Pairs	Hard	Array, String, Hash_Table, Trie	2451	67.33
0335	Self Crossing	Hard	Array, Math, Geometry	477	100.00
0334	Increasing Triplet Subsequence	Medium	Top_Interview_Questions, Array, Greedy, Data_Structure_II_Day_5_Array	672	60.61
0332	Reconstruct Itinerary	Hard	Depth_First_Search, Graph, Eulerian_Circuit	240	93.88
0331	Verify Preorder Serialization of a Binary Tree	Medium	String, Tree, Binary_Tree, Stack	335	70.00
0330	Patching Array	Hard	Array, Greedy	201	100.00
0329	Longest Increasing Path in a Matrix	Hard	Top_Interview_Questions, Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Graph, Memoization, Topological_Sort	322	92.65
0328	Odd Even Linked List	Medium	Top_Interview_Questions, Linked_List, Level_2_Day_4_Linked_List, Udemy_Linked_List	216	86.96
0327	Count of Range Sum	Hard	Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort	638	100.00
0326	Power of Three	Easy	Top_Interview_Questions, Math, Recursion	413	76.12
0324	Wiggle Sort II	Medium	Top_Interview_Questions, Array, Sorting, Divide_and_Conquer, Quickselect	545	57.14
0322	Coin Change	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_20, Level_2_Day_12_Dynamic_Programming	332	50.68
0321	Create Maximum Number	Hard	Greedy, Stack, Monotonic_Stack	209	100.00
0319	Bulb Switcher	Medium	Math, Brainteaser	214	77.78
0318	Maximum Product of Word Lengths	Medium	Array, String, Bit_Manipulation	477	100.00
0316	Remove Duplicate Letters	Medium	String, Greedy, Stack, Monotonic_Stack	291	81.82
0315	Count of Smaller Numbers After Self	Hard	Top_Interview_Questions, Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort	1282	88.46
0313	Super Ugly Number	Medium	Array, Dynamic_Programming, Math	330	100.00
0312	Burst Balloons	Hard	Array, Dynamic_Programming	210	100.00
0310	Minimum Height Trees	Medium	Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort	521	97.56
0309	Best Time to Buy and Sell Stock with Cooldown	Medium	Array, Dynamic_Programming, Dynamic_Programming_I_Day_8	272	73.33
0307	Range Sum Query - Mutable	Medium	Array, Design, Segment_Tree, Binary_Indexed_Tree	1729	78.79
0306	Additive Number	Medium	String, Backtracking	289	22.22
0304	Range Sum Query 2D - Immutable	Medium	Array, Matrix, Design, Prefix_Sum, Dynamic_Programming_I_Day_14, Programming_Skills_II_Day_13, Udemy_2D_Arrays/Matrix	1373	85.71
0303	Range Sum Query - Immutable	Easy	Array, Design, Prefix_Sum, Programming_Skills_I_Day_12_Class_and_Object	472	63.64
0301	Remove Invalid Parentheses	Hard	String, Breadth_First_Search, Backtracking	312	100.00
0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search, Algorithm_II_Day_16_Dynamic_Programming, Binary_Search_II_Day_3, Dynamic_Programming_I_Day_18, Udemy_Dynamic_Programming	318	82.28
0299	Bulls and Cows	Medium	String, Hash_Table, Counting, Level_1_Day_13_Hashmap	254	84.82
0297	Serialize and Deserialize Binary Tree	Hard	Top_Interview_Questions, String, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design, Data_Structure_II_Day_18_Tree, Udemy_Tree_Stack_Queue	475	78.85
0295	Find Median from Data Stream	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Design, Heap_Priority_Queue, Data_Stream	2289	33.60
0292	Nim Game	Easy	Math, Game_Theory, Brainteaser	129	94.29
0290	Word Pattern	Easy	String, Hash_Table, Data_Structure_II_Day_7_String	177	89.55
0289	Game of Life	Medium	Top_Interview_Questions, Array, Matrix, Simulation	174	96.97
0287	Find the Duplicate Number	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Two_Pointers, Bit_Manipulation, Binary_Search_II_Day_5	656	66.21
0284	Peeking Iterator	Medium	Array, Design, Iterator	286	62.50
0283	Move Zeroes	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Two_Pointers, Algorithm_I_Day_3_Two_Pointers, Programming_Skills_I_Day_6_Array, Udemy_Arrays	516	79.07
0282	Expression Add Operators	Hard	String, Math, Backtracking	367	85.71
0279	Perfect Squares	Medium	Top_Interview_Questions, Dynamic_Programming, Math, Breadth_First_Search, Dynamic_Programming_I_Day_21	176	98.80
0278	First Bad Version	Easy	Binary_Search, Interactive, Algorithm_I_Day_1_Binary_Search, Binary_Search_I_Day_5, Level_1_Day_7_Binary_Search	349	76.86
0275	H-Index II	Medium	Array, Binary_Search, Binary_Search_II_Day_8	398	81.82
0274	H-Index	Medium	Array, Sorting, Counting_Sort	291	45.45
0273	Integer to English Words	Hard	String, Math, Recursion, Udemy_Strings	273	82.93
0268	Missing Number	Easy	Top_Interview_Questions, Array, Hash_Table, Math, Sorting, Binary_Search, Bit_Manipulation	380	83.49
0264	Ugly Number II	Medium	Hash_Table, Dynamic_Programming, Math, Heap_Priority_Queue, Dynamic_Programming_I_Day_11	182	95.45
0263	Ugly Number	Easy	Math	243	64.10
0262	Trips and Users	Hard	Database	577	63.97
0260	Single Number III	Medium	Array, Bit_Manipulation	222	100.00
0258	Add Digits	Easy	Math, Simulation, Number_Theory	234	71.64
0257	Binary Tree Paths	Easy	String, Depth_First_Search, Tree, Binary_Tree, Backtracking	320	72.84
0242	Valid Anagram	Easy	Top_Interview_Questions, String, Hash_Table, Sorting, Data_Structure_I_Day_6_String, Programming_Skills_I_Day_11_Containers_and_Libraries, Udemy_Strings	251	87.65
0241	Different Ways to Add Parentheses	Medium	String, Dynamic_Programming, Math, Recursion, Memoization	294	73.47
0240	Search a 2D Matrix II	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer, Data_Structure_II_Day_4_Array, Binary_Search_II_Day_8	460	66.08
0239	Sliding Window Maximum	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue, Udemy_Arrays	1059	86.14
0238	Product of Array Except Self	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Prefix_Sum, Data_Structure_II_Day_5_Array, Udemy_Arrays	669	48.96
0237	Delete Node in a Linked List	Easy	Top_Interview_Questions, Linked_List	183	93.00
0236	Lowest Common Ancestor of a Binary Tree	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_18_Tree, Udemy_Tree_Stack_Queue	386	45.21
0235	Lowest Common Ancestor of a Binary Search Tree	Easy	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_14_Tree, Level_1_Day_8_Binary_Search_Tree	404	75.59
0234	Palindrome Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Stack, Linked_List, Recursion, Level_2_Day_3_Linked_List, Udemy_Linked_List	641	79.53
0233	Number of Digit One	Hard	Dynamic_Programming, Math, Recursion	129	100.00
0232	Implement Queue using Stacks	Easy	Stack, Design, Queue, Data_Structure_I_Day_9_Stack_Queue, Programming_Skills_I_Day_11_Containers_and_Libraries, Level_2_Day_16_Design	258	70.86
0231	Power of Two	Easy	Math, Bit_Manipulation, Recursion, Algorithm_I_Day_13_Bit_Manipulation	161	86.81
0230	Kth Smallest Element in a BST	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_II_Day_17_Tree, Level_2_Day_9_Binary_Search_Tree	393	33.33
0229	Majority Element II	Medium	Array, Hash_Table, Sorting, Counting	408	71.21
0228	Summary Ranges	Easy	Array	169	91.89
0227	Basic Calculator II	Medium	Top_Interview_Questions, String, Math, Stack, Level_2_Day_18_Stack	383	62.50
0226	Invert Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_12_Tree, Level_2_Day_6_Tree, Udemy_Tree_Stack_Queue	233	54.90
0225	Implement Stack using Queues	Easy	Stack, Design, Queue	248	73.44
0224	Basic Calculator	Hard	String, Math, Stack, Recursion	294	93.33
0223	Rectangle Area	Medium	Math, Geometry	291	66.67
0222	Count Complete Tree Nodes
0221	Maximal Square	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_16	614	44.00
0220	Contains Duplicate III	Medium	Array, Sorting, Sliding_Window, Ordered_Set, Bucket_Sort	921	72.22
0219	Contains Duplicate II	Easy	Array, Hash_Table, Sliding_Window	813	80.46
0218	The Skyline Problem	Hard	Top_Interview_Questions, Array, Heap_Priority_Queue, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Line_Sweep	365	93.14
0217	Contains Duplicate	Easy	Top_Interview_Questions, Array, Hash_Table, Sorting, Data_Structure_I_Day_1_Array, Programming_Skills_I_Day_11_Containers_and_Libraries, Udemy_Arrays	719	73.49
0216	Combination Sum III	Medium	Array, Backtracking, Udemy_Backtracking/Recursion	175	90.91
0215	Kth Largest Element in an Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect, Data_Structure_II_Day_20_Heap_Priority_Queue	839	34.43
0214	Shortest Palindrome	Hard	String, Hash_Function, String_Matching, Rolling_Hash	278	100.00
0213	House Robber II	Medium	Array, Dynamic_Programming, Algorithm_II_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_3, Udemy_Dynamic_Programming	257	59.62
0212	Word Search II	Hard	Top_Interview_Questions, Array, String, Matrix, Backtracking, Trie	268	100.00
0211	Design Add and Search Words Data Structure	Medium	String, Depth_First_Search, Design, Trie	2256	87.04
0210	Course Schedule II	Medium	Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort, Level_2_Day_11_Graph/BFS/DFS	266	96.32
0209	Minimum Size Subarray Sum	Medium	Array, Binary_Search, Prefix_Sum, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Binary_Search_II_Day_1	315	96.73
0208	Implement Trie (Prefix Tree)	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie, Level_2_Day_16_Design, Udemy_Trie_and_Heap	689	61.00
0207	Course Schedule	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort	416	40.10
0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Data_Structure_I_Day_8_Linked_List, Algorithm_I_Day_10_Recursion_Backtracking, Level_1_Day_3_Linked_List, Udemy_Linked_List	279	45.78
0205	Isomorphic Strings	Easy	String, Hash_Table, Level_1_Day_2_String	278	79.96
0204	Count Primes	Medium	Top_Interview_Questions, Array, Math, Enumeration, Number_Theory	360	96.61
0203	Remove Linked List Elements	Easy	Linked_List, Recursion, Data_Structure_I_Day_7_Linked_List	233	91.22
0202	Happy Number	Easy	Top_Interview_Questions, Hash_Table, Math, Two_Pointers, Algorithm_II_Day_21_Others, Programming_Skills_I_Day_4_Loop, Level_2_Day_1_Implementation/Simulation	261	45.08
0201	Bitwise AND of Numbers Range	Medium	Bit_Manipulation, Algorithm_II_Day_19_Bit_Manipulation	368	80.00
0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Algorithm_II_Day_6_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_1_Matrix_Related_Problems, Level_1_Day_9_Graph/BFS/DFS, Udemy_Graph	252	95.41
0199	Binary Tree Right Side View	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_16_Tree, Level_2_Day_15_Tree	194	92.89
0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_3, Level_2_Day_12_Dynamic_Programming, Udemy_Dynamic_Programming	156	92.24
0197	Rising Temperature	Easy	Database, SQL_I_Day_6_Union	394	94.15
0196	Delete Duplicate Emails	Easy	Database, SQL_I_Day_2_Select_and_Order	593	94.17
0195	Tenth Line	Easy	Shell	36	87.50
0194	Transpose File	Medium	Shell	477	28.60
0193	Valid Phone Numbers	Easy	Shell	98	88.64
0192	Word Frequency	Medium	Shell	114	73.60
0191	Number of 1 Bits	Easy	Top_Interview_Questions, Bit_Manipulation, Algorithm_I_Day_13_Bit_Manipulation, Programming_Skills_I_Day_2_Operator, Udemy_Bit_Manipulation	237	68.44
0190	Reverse Bits	Easy	Top_Interview_Questions, Bit_Manipulation, Divide_and_Conquer, Algorithm_I_Day_14_Bit_Manipulation, Udemy_Bit_Manipulation	198	81.82
0189	Rotate Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers, Algorithm_I_Day_2_Two_Pointers, Udemy_Arrays	483	86.95
0188	Best Time to Buy and Sell Stock IV	Hard	Array, Dynamic_Programming	293	68.31
0187	Repeated DNA Sequences	Medium	String, Hash_Table, Bit_Manipulation, Sliding_Window, Hash_Function, Rolling_Hash, Data_Structure_II_Day_9_String, Udemy_Strings	319	79.03
0185	Department Top Three Salaries	Hard	Database	757	87.06
0184	Department Highest Salary	Medium	Database	637	76.01
0183	Customers Who Never Order	Easy	Database, SQL_I_Day_1_Select	712	33.67
0182	Duplicate Emails	Easy	Database, SQL_I_Day_10_Where	396	68.40
0181	Employees Earning More Than Their Managers	Easy	Database	351	94.75
0180	Consecutive Numbers	Medium	Database	695	38.05
0179	Largest Number	Medium	Top_Interview_Questions, String, Sorting, Greedy	380	43.40
0178	Rank Scores	Medium	Database	292	85.14
0177	Nth Highest Salary	Medium	Database	338	86.68
0176	Second Highest Salary	Medium	Database, SQL_I_Day_4_Union_and_Select	219	92.54
0175	Combine Two Tables	Easy	Database, SQL_I_Day_5_Union	473	54.97
0174	Dungeon Game	Hard	Array, Dynamic_Programming, Matrix	300	66.67
0173	Binary Search Tree Iterator	Medium	Tree, Binary_Tree, Stack, Design, Binary_Search_Tree, Iterator, Data_Structure_II_Day_17_Tree, Programming_Skills_II_Day_16, Level_2_Day_9_Binary_Search_Tree	563	46.91
0172	Factorial Trailing Zeroes	Medium	Top_Interview_Questions, Math, Udemy_Integers	220	67.65
0171	Excel Sheet Column Number	Easy	Top_Interview_Questions, String, Math	310	30.68
0169	Majority Element	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer, Data_Structure_II_Day_1_Array, Udemy_Famous_Algorithm	460	51.25
0168	Excel Sheet Column Title	Easy	String, Math	246	30.12
0167	Two Sum II - Input Array Is Sorted	Medium	Array, Binary_Search, Two_Pointers, Algorithm_I_Day_3_Two_Pointers, Binary_Search_I_Day_7	403	68.74
0166	Fraction to Recurring Decimal	Medium	Top_Interview_Questions, String, Hash_Table, Math	147	90.91
0165	Compare Version Numbers	Medium	String, Two_Pointers	144	100.00
0164	Maximum Gap	Hard	Array, Sorting, Bucket_Sort, Radix_Sort	991	68.00
0162	Find Peak Element	Medium	Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_2_Binary_Search, Binary_Search_II_Day_12	297	53.85
0160	Intersection of Two Linked Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_II_Day_11_Linked_List, Udemy_Linked_List	262	83.50
0155	Min Stack	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Data_Structure_II_Day_14_Stack_Queue, Programming_Skills_II_Day_18, Level_2_Day_16_Design, Udemy_Design	331	84.88
0154	Find Minimum in Rotated Sorted Array II	Hard	Array, Binary_Search, Binary_Search_II_Day_13	275	84.00
0153	Find Minimum in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Array, Binary_Search, Algorithm_II_Day_2_Binary_Search, Binary_Search_I_Day_12, Udemy_Binary_Search	262	60.96
0152	Maximum Product Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Dynamic_Programming_I_Day_6, Level_2_Day_13_Dynamic_Programming, Udemy_Dynamic_Programming	253	88.42
0151	Reverse Words in a String	Medium	String, Two_Pointers, Udemy_Strings	206	98.90
0150	Evaluate Reverse Polish Notation	Medium	Top_Interview_Questions, Array, Math, Stack, Programming_Skills_II_Day_3	233	88.82
0149	Max Points on a Line	Hard	Top_Interview_Questions, Array, Hash_Table, Math, Geometry, Algorithm_II_Day_21_Others	307	83.33
0148	Sort List	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Linked_List, Divide_and_Conquer, Merge_Sort, Level_2_Day_4_Linked_List	820	61.70
0147	Insertion Sort List	Medium	Sorting, Linked_List	385	52.00
0146	LRU Cache	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Design, Linked_List, Doubly_Linked_List, Udemy_Linked_List	1116	97.93
0145	Binary Tree Postorder Traversal	Easy	Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree, Udemy_Tree_Stack_Queue	211	80.00
0144	Binary Tree Preorder Traversal	Easy	Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree, Udemy_Tree_Stack_Queue	277	37.90
0143	Reorder List	Medium	Two_Pointers, Stack, Linked_List, Recursion, Data_Structure_II_Day_13_Linked_List, Programming_Skills_II_Day_14	395	82.26
0142	Linked List Cycle II	Medium	Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_II_Day_10_Linked_List, Level_1_Day_4_Linked_List, Udemy_Linked_List	192	63.39
0141	Linked List Cycle	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_I_Day_7_Linked_List, Udemy_Linked_List	223	91.85
0140	Word Break II	Hard	Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Backtracking, Trie, Memoization	287	44.19
0139	Word Break	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization, Algorithm_II_Day_15_Dynamic_Programming, Dynamic_Programming_I_Day_9, Udemy_Dynamic_Programming	197	87.17
0138	Copy List with Random Pointer	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List, Programming_Skills_II_Day_14, Udemy_Linked_List	274	80.58
0137	Single Number II	Medium	Array, Bit_Manipulation	344	64.29
0136	Single Number	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Data_Structure_II_Day_1_Array, Algorithm_I_Day_14_Bit_Manipulation, Udemy_Integers	344	83.63
0135	Candy	Hard	Array, Greedy	466	58.33
0134	Gas Station	Medium	Top_Interview_Questions, Array, Greedy	545	70.18
0133	Clone Graph	Medium	Hash_Table, Depth_First_Search, Breadth_First_Search, Graph, Udemy_Graph	351	60.91
0132	Palindrome Partitioning II	Hard	String, Dynamic_Programming	290	100.00
0131	Palindrome Partitioning	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking	820	87.27
0130	Surrounded Regions	Medium	Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Algorithm_II_Day_8_Breadth_First_Search_Depth_First_Search	355	84.42
0129	Sum Root to Leaf Numbers	Medium	Depth_First_Search, Tree, Binary_Tree	269	29.63
0128	Longest Consecutive Sequence	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Union_Find	460	97.77
0127	Word Ladder	Hard	Top_Interview_Questions, String, Hash_Table, Breadth_First_Search, Graph_Theory_I_Day_12_Breadth_First_Search	396	98.68
0126	Word Ladder II	Hard	String, Hash_Table, Breadth_First_Search, Backtracking	418	51.45
0125	Valid Palindrome	Easy	Top_Interview_Questions, String, Two_Pointers, Udemy_Two_Pointers	353	52.06
0124	Binary Tree Maximum Path Sum	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Udemy_Tree_Stack_Queue	331	74.42
0123	Best Time to Buy and Sell Stock III	Hard	Array, Dynamic_Programming	585	95.24
0122	Best Time to Buy and Sell Stock II	Medium	Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_7, Udemy_Arrays	370	16.98
0121	Best Time to Buy and Sell Stock	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Data_Structure_I_Day_3_Array, Dynamic_Programming_I_Day_7, Level_1_Day_5_Greedy, Udemy_Arrays	609	94.06
0120	Triangle	Medium	Array, Dynamic_Programming, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_13, Udemy_Dynamic_Programming	194	97.87
0119	Pascal's Triangle II	Easy	Array, Dynamic_Programming, Data_Structure_II_Day_3_Array, Dynamic_Programming_I_Day_12, Udemy_Dynamic_Programming	296	19.15
0118	Pascal's Triangle	Easy	Top_Interview_Questions, Array, Dynamic_Programming, Data_Structure_I_Day_4_Array, Dynamic_Programming_I_Day_12, Udemy_Dynamic_Programming	277	33.22
0117	Populating Next Right Pointers in Each Node II	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List, Algorithm_II_Day_7_Breadth_First_Search_Depth_First_Search	199	94.67
0116	Populating Next Right Pointers in Each Node	Medium	Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List, Algorithm_I_Day_8_Breadth_First_Search_Depth_First_Search	355	69.02
0115	Distinct Subsequences	Hard	String, Dynamic_Programming	285	88.89
0114	Flatten Binary Tree to Linked List	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Linked_List, Udemy_Linked_List	191	93.10
0113	Path Sum II	Medium	Depth_First_Search, Tree, Binary_Tree, Backtracking, Data_Structure_II_Day_16_Tree	364	78.67
0112	Path Sum	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_12_Tree	322	36.41
0111	Minimum Depth of Binary Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Udemy_Tree_Stack_Queue	525	90.51
0110	Balanced Binary Tree	Easy	Depth_First_Search, Tree, Binary_Tree, Programming_Skills_II_Day_2, Level_2_Day_6_Tree, Udemy_Tree_Stack_Queue	310	63.63
0109	Convert Sorted List to Binary Search Tree	Medium	Tree, Binary_Tree, Linked_List, Binary_Search_Tree, Divide_and_Conquer	376	59.26
0108	Convert Sorted Array to Binary Search Tree	Easy	Top_Interview_Questions, Array, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer, Data_Structure_II_Day_15_Tree, Level_2_Day_9_Binary_Search_Tree, Udemy_Tree_Stack_Queue	334	35.39
0107	Binary Tree Level Order Traversal II	Medium	Breadth_First_Search, Tree, Binary_Tree	204	98.04
0106	Construct Binary Tree from Inorder and Postorder Traversal	Medium	Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer	358	61.29
0105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer, Data_Structure_II_Day_15_Tree	370	58.31
0104	Maximum Depth of Binary Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_11_Tree, Programming_Skills_I_Day_10_Linked_List_and_Tree, Udemy_Tree_Stack_Queue	236	83.39
0103	Binary Tree Zigzag Level Order Traversal	Medium	Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_15_Tree, Udemy_Tree_Stack_Queue	316	34.25
0102	Binary Tree Level Order Traversal	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_11_Tree, Level_1_Day_6_Tree, Udemy_Tree_Stack_Queue	355	29.37
0101	Symmetric Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_11_Tree, Level_2_Day_15_Tree	290	26.98
0100	Same Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Level_2_Day_15_Tree, Udemy_Tree_Stack_Queue	208	72.24
0099	Recover Binary Search Tree	Medium	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	492	39.39
0098	Validate Binary Search Tree	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_14_Tree, Level_1_Day_8_Binary_Search_Tree, Udemy_Tree_Stack_Queue	330	41.38
0097	Interleaving String	Medium	String, Dynamic_Programming	240	57.50
0096	Unique Binary Search Trees	Medium	Top_100_Liked_Questions, Dynamic_Programming, Math, Tree, Binary_Tree, Binary_Search_Tree, Dynamic_Programming_I_Day_11	147	88.52
0095	Unique Binary Search Trees II	Medium	Dynamic_Programming, Tree, Binary_Tree, Backtracking, Binary_Search_Tree	360	41.38
0094	Binary Tree Inorder Traversal	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree, Udemy_Tree_Stack_Queue	269	38.80
0093	Restore IP Addresses	Medium	String, Backtracking	304	73.33
0092	Reverse Linked List II	Medium	Linked_List	191	82.35
0091	Decode Ways	Medium	Top_Interview_Questions, String, Dynamic_Programming, Algorithm_II_Day_15_Dynamic_Programming, Dynamic_Programming_I_Day_10	237	76.88
0090	Subsets II	Medium	Array, Bit_Manipulation, Backtracking, Algorithm_II_Day_9_Recursion_Backtracking	366	58.09
0089	Gray Code	Medium	Math, Bit_Manipulation, Backtracking	273	100.00
0088	Merge Sorted Array	Easy	Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_I_Day_2_Array	311	33.40
0087	Scramble String	Hard	String, Dynamic_Programming	366	85.00
0086	Partition List	Medium	Two_Pointers, Linked_List	172	94.00
0085	Maximal Rectangle	Hard	Array, Dynamic_Programming, Matrix, Stack, Monotonic_Stack	463	55.17
0084	Largest Rectangle in Histogram	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Stack, Monotonic_Stack	525	100.00
0083	Remove Duplicates from Sorted List	Easy	Linked_List, Data_Structure_I_Day_8_Linked_List	274	77.82
0082	Remove Duplicates from Sorted List II	Medium	Two_Pointers, Linked_List, Data_Structure_II_Day_11_Linked_List, Algorithm_II_Day_3_Two_Pointers	241	91.04
0081	Search in Rotated Sorted Array II	Medium	Array, Binary_Search, Binary_Search_II_Day_12	352	42.31
0080	Remove Duplicates from Sorted Array II	Medium	Array, Two_Pointers, Udemy_Arrays	357	44.78
0079	Word Search	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking	463	68.49
0078	Subsets	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Algorithm_II_Day_9_Recursion_Backtracking, Udemy_Backtracking/Recursion	353	30.14
0077	Combinations	Medium	Backtracking, Algorithm_I_Day_11_Recursion_Backtracking	244	100.00
0076	Minimum Window Substring	Hard	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Level_2_Day_14_Sliding_Window/Two_Pointer	346	85.20
0075	Sort Colors	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_II_Day_2_Array, Udemy_Arrays	198	85.66
0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Data_Structure_I_Day_5_Array, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_8, Level_2_Day_8_Binary_Search, Udemy_2D_Arrays/Matrix	290	40.17
0073	Set Matrix Zeroes	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Matrix, Udemy_2D_Arrays/Matrix	255	100.00
0072	Edit Distance	Hard	Top_100_Liked_Questions, String, Dynamic_Programming, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_19, Udemy_Dynamic_Programming	320	63.53
0071	Simplify Path	Medium	String, Stack	318	64.44
0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_2, Level_1_Day_10_Dynamic_Programming, Udemy_Dynamic_Programming	127	97.06
0069	Sqrt(x)	Easy	Top_Interview_Questions, Math, Binary_Search, Binary_Search_I_Day_4	153	95.75
0068	Text Justification	Hard	Array, String, Simulation	269	50.00
0067	Add Binary	Easy	String, Math, Bit_Manipulation, Simulation, Programming_Skills_II_Day_5	327	32.67
0066	Plus One	Easy	Top_Interview_Questions, Array, Math, Programming_Skills_II_Day_3, Udemy_Arrays	303	35.18
0065	Valid Number	Hard	String	310	81.82
0064	Minimum Path Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_16, Udemy_Dynamic_Programming	222	95.70
0063	Unique Paths II	Medium	Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_15	187	84.62
0062	Unique Paths	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Algorithm_II_Day_13_Dynamic_Programming, Dynamic_Programming_I_Day_15, Level_1_Day_11_Dynamic_Programming	209	49.18
0061	Rotate List	Medium	Two_Pointers, Linked_List, Programming_Skills_II_Day_16, Udemy_Linked_List	193	92.16
0060	Permutation Sequence	Hard	Math, Recursion	293	27.78
0059	Spiral Matrix II	Medium	Array, Matrix, Simulation, Data_Structure_II_Day_3_Array	153	100.00
0058	Length of Last Word	Easy	String, Programming_Skills_II_Day_6, Udemy_Arrays	243	63.33
0057	Insert Interval	Medium	Array, Level_2_Day_17_Interval	257	99.52
0056	Merge Intervals	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Data_Structure_II_Day_2_Array, Level_2_Day_17_Interval, Udemy_2D_Arrays/Matrix	323	99.68
0055	Jump Game	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Algorithm_II_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_4, Udemy_Arrays	670	66.67
0054	Spiral Matrix	Medium	Top_Interview_Questions, Array, Matrix, Simulation, Programming_Skills_II_Day_8, Level_2_Day_1_Implementation/Simulation, Udemy_2D_Arrays/Matrix	224	62.50
0053	Maximum Subarray	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Data_Structure_I_Day_1_Array, Dynamic_Programming_I_Day_5, Udemy_Famous_Algorithm	662	82.48
0052	N-Queens II	Hard	Backtracking	231	80.00
0051	N-Queens	Hard	Top_100_Liked_Questions, Array, Backtracking	243	95.10
0050	Pow(x, n)	Medium	Top_Interview_Questions, Math, Recursion, Udemy_Integers	264	52.98
0049	Group Anagrams	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Data_Structure_II_Day_8_String, Programming_Skills_II_Day_11, Udemy_Strings	506	86.55
0048	Rotate Image	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Data_Structure_II_Day_3_Array, Programming_Skills_II_Day_7, Udemy_2D_Arrays/Matrix	287	46.50
0047	Permutations II	Medium	Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking	406	76.36
0046	Permutations	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Algorithm_I_Day_11_Recursion_Backtracking, Level_2_Day_20_Brute_Force/Backtracking, Udemy_Backtracking/Recursion	186	100.00
0045	Jump Game II	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Algorithm_II_Day_13_Dynamic_Programming, Dynamic_Programming_I_Day_4	227	98.14
0044	Wildcard Matching	Hard	Top_Interview_Questions, String, Dynamic_Programming, Greedy, Recursion, Udemy_Dynamic_Programming	401	86.11
0043	Multiply Strings	Medium	String, Math, Simulation, Data_Structure_II_Day_8_String, Programming_Skills_II_Day_4, Level_2_Day_2_String	390	56.25
0042	Trapping Rain Water	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack, Dynamic_Programming_I_Day_9, Udemy_Two_Pointers	196	100.00
0041	First Missing Positive	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Udemy_Arrays	345	100.00
0040	Combination Sum II	Medium	Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking	348	80.92
0039	Combination Sum	Medium	Top_100_Liked_Questions, Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking, Level_2_Day_20_Brute_Force/Backtracking, Udemy_Backtracking/Recursion	317	86.85
0038	Count and Say	Medium	Top_Interview_Questions, String	317	41.11
0037	Sudoku Solver	Hard	Array, Matrix, Backtracking	294	79.69
0036	Valid Sudoku	Medium	Top_Interview_Questions, Array, Hash_Table, Matrix, Data_Structure_I_Day_5_Array	346	65.03
0035	Search Insert Position	Easy	Top_100_Liked_Questions, Array, Binary_Search, Algorithm_I_Day_1_Binary_Search, Binary_Search_I_Day_2	267	50.32
0034	Find First and Last Position of Element in Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_5	228	83.38
0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_11, Level_2_Day_8_Binary_Search, Udemy_Binary_Search	184	86.08
0032	Longest Valid Parentheses	Hard	Top_100_Liked_Questions, String, Dynamic_Programming, Stack	215	95.71
0031	Next Permutation	Medium	Top_100_Liked_Questions, Array, Two_Pointers	211	94.23
0030	Substring with Concatenation of All Words	Hard	String, Hash_Table, Sliding_Window	441	85.84
0029	Divide Two Integers	Medium	Top_Interview_Questions, Math, Bit_Manipulation, Udemy_Bit_Manipulation	281	31.67
0028	Find the Index of the First Occurrence in a String	Easy	Top_Interview_Questions, String, Two_Pointers, String_Matching, Programming_Skills_II_Day_1	257	32.35
0027	Remove Element	Easy	Array, Two_Pointers	293	32.19
0026	Remove Duplicates from Sorted Array	Easy	Top_Interview_Questions, Array, Two_Pointers, Udemy_Two_Pointers	361	77.19
0025	Reverse Nodes in k-Group	Hard	Top_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_13_Linked_List, Udemy_Linked_List	194	87.72
0024	Swap Nodes in Pairs	Medium	Top_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_12_Linked_List, Udemy_Linked_List	149	99.39
0023	Merge k Sorted Lists	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Heap_Priority_Queue, Linked_List, Divide_and_Conquer, Merge_Sort	323	75.14
0022	Generate Parentheses	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking, Udemy_Backtracking/Recursion	210	78.51
0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Data_Structure_I_Day_7_Linked_List, Algorithm_I_Day_10_Recursion_Backtracking, Level_1_Day_3_Linked_List, Udemy_Linked_List	176	96.25
0020	Valid Parentheses	Easy	Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Data_Structure_I_Day_9_Stack_Queue, Udemy_Strings	226	72.53
0019	Remove Nth Node From End of List	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Algorithm_I_Day_5_Two_Pointers, Level_2_Day_3_Linked_List	180	91.58
0018	4Sum	Medium	Array, Sorting, Two_Pointers	244	100.00
0017	Letter Combinations of a Phone Number	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking, Udemy_Backtracking/Recursion	262	73.59
0016	3Sum Closest	Medium	Array, Sorting, Two_Pointers, Level_2_Day_14_Sliding_Window/Two_Pointer	413	95.05
0015	3Sum	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_II_Day_1_Array, Algorithm_II_Day_3_Two_Pointers, Udemy_Two_Pointers	761	90.55
0014	Longest Common Prefix	Easy	Top_Interview_Questions, String, Level_2_Day_2_String, Udemy_Strings	209	88.86
0013	Roman to Integer	Easy	Top_Interview_Questions, String, Hash_Table, Math	358	75.16
0012	Integer to Roman	Medium	String, Hash_Table, Math	223	93.87
0011	Container With Most Water	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers, Algorithm_II_Day_4_Two_Pointers	474	89.18
0010	Regular Expression Matching	Hard	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Recursion, Udemy_Dynamic_Programming	292	58.58
0009	Palindrome Number	Easy	Math, Udemy_Integers	238	96.24
0008	String to Integer (atoi)	Medium	Top_Interview_Questions, String	196	96.46
0007	Reverse Integer	Medium	Top_Interview_Questions, Math, Udemy_Integers	245	60.32
0006	Zigzag Conversion	Medium	String	366	80.62
0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Data_Structure_II_Day_9_String, Algorithm_II_Day_14_Dynamic_Programming, Dynamic_Programming_I_Day_17, Udemy_Strings	323	75.48
0004	Median of Two Sorted Arrays	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Divide_and_Conquer	355	83.48
0003	Longest Substring Without Repeating Characters	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Algorithm_I_Day_6_Sliding_Window, Level_2_Day_14_Sliding_Window/Two_Pointer, Udemy_Strings	258	91.09
0002	Add Two Numbers	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Data_Structure_II_Day_10_Linked_List, Programming_Skills_II_Day_15	417	50.44
0001	Two Sum	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Data_Structure_I_Day_2_Array, Level_1_Day_13_Hashmap, Udemy_Arrays	234	92.75

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Binary Search II

Day 1

Day 2

Day 3

Day 4

Day 5

Day 6

Day 7

Day 8

Day 9

Day 10

Day 11

Day 12

Day 13

Day 14

Day 15

Day 16

Day 17

Day 18

Day 19

Day 20

Dynamic Programming I

Day 1

Day 2

Day 3

Day 4

Day 5

Day 6

Day 7

Day 8

Day 9

Day 10

Day 11

Day 12

Day 13

Day 14

Day 15

Day 16

Day 17

Day 18

Day 19

Day 20

Day 21

Programming Skills I

Day 1 Basic Data Type

Day 2 Operator

Day 3 Conditional Statements

Day 4 Loop

Day 5 Function

Day 6 Array

Day 7 Array

Day 8 String

Day 9 String

Day 10 Linked List and Tree

Day 11 Containers and Libraries

Day 12 Class and Object

Programming Skills II

Day 1

Day 2

Day 3

Day 4

Day 5

Day 6

Day 7

Day 8

Day 9

Day 10

Day 11

Day 12

Day 13

Day 14

Day 15

Day 16