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Kotlin-based LeetCode algorithm problem solutions, regularly updated.

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LeetCode-in-Kotlin/LeetCode-in-Kotlin.github.io

 
 

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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."

Algorithm II

Day 1 Binary Search

0034Find First and Last Position of Element in Sorted ArrayMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search22883.38
0033Search in Rotated Sorted ArrayMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search18486.08
0074Search a 2D MatrixMediumTop_100_Liked_Questions, Array, Binary_Search, Matrix29040.17

Day 2 Binary Search

0153Find Minimum in Rotated Sorted ArrayMediumTop_100_Liked_Questions, Array, Binary_Search26260.96

Day 3 Two Pointers

0082Remove Duplicates from Sorted List IIMediumTwo_Pointers, Linked_List24191.04
00153SumMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers105955.28

Day 4 Two Pointers

0011Container With Most WaterMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers47489.18

Day 5 Sliding Window

0438Find All Anagrams in a StringMediumTop_100_Liked_Questions, String, Hash_Table, Sliding_Window56154.68

Day 6 Breadth First Search Depth First Search

0200Number of IslandsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find25295.41

Day 7 Breadth First Search Depth First Search

Day 8 Breadth First Search Depth First Search

Day 9 Recursion Backtracking

0078SubsetsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking35330.14
0090Subsets IIMediumArray, Bit_Manipulation, Backtracking36658.09

Day 10 Recursion Backtracking

0047Permutations IIMediumArray, Backtracking40676.36
0039Combination SumMediumTop_100_Liked_Questions, Array, Backtracking31786.85
0040Combination Sum IIMediumArray, Backtracking34880.92

Day 11 Recursion Backtracking

0017Letter Combinations of a Phone NumberMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking132100.00
0022Generate ParenthesesMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking21078.51
0079Word SearchMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Backtracking46368.49

Day 12 Dynamic Programming

0055Jump GameMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy67066.67

Day 13 Dynamic Programming

0045Jump Game IIMediumTop_100_Liked_Questions, Array, Dynamic_Programming, Greedy22798.14
0062Unique PathsMediumTop_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics20949.18

Day 14 Dynamic Programming

0005Longest Palindromic SubstringMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming32375.48

Day 15 Dynamic Programming

0091Decode WaysMediumTop_Interview_Questions, String, Dynamic_Programming23776.88
0139Word BreakMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization19787.17

Day 16 Dynamic Programming

0300Longest Increasing SubsequenceMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search31882.28

Day 17 Dynamic Programming

1143Longest Common SubsequenceMediumTop_100_Liked_Questions, String, Dynamic_Programming30738.36

Day 18 Dynamic Programming

0072Edit DistanceHardTop_100_Liked_Questions, String, Dynamic_Programming32063.53
0322Coin ChangeMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search33250.68

Day 19 Bit Manipulation

Day 20 Others

Day 21 Others

Binary Search I

Day 1

Day 2

0035Search Insert PositionEasyTop_100_Liked_Questions, Array, Binary_Search26750.32

Day 3

Day 4

0069Sqrt(x)EasyTop_Interview_Questions, Math, Binary_Search15395.75

Day 5

0034Find First and Last Position of Element in Sorted ArrayMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search22883.38

Day 6

Day 7

Day 8

0074Search a 2D MatrixMediumTop_100_Liked_Questions, Array, Binary_Search, Matrix29040.17

Day 9

Day 10

Day 11

0033Search in Rotated Sorted ArrayMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search18486.08

Day 12

0153Find Minimum in Rotated Sorted ArrayMediumTop_100_Liked_Questions, Array, Binary_Search26260.96

Binary Search II

Day 1

Day 2

Day 3

0300Longest Increasing SubsequenceMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search31882.28

Day 4

Day 5

0287Find the Duplicate NumberMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Two_Pointers, Bit_Manipulation65666.21

Day 6

Day 7

Day 8

0240Search a 2D Matrix IIMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer46066.08

Day 9

Day 10

Day 11

Day 12

0081Search in Rotated Sorted Array IIMediumArray, Binary_Search35242.31

Day 13

Day 14

Day 15

Day 16

Day 17

Day 18

Day 19

Day 20

Dynamic Programming I

Day 1

Day 2

0070Climbing StairsEasyTop_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization12797.06

Day 3

0198House RobberMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming15692.24

Day 4

0055Jump GameMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy67066.67
0045Jump Game IIMediumTop_100_Liked_Questions, Array, Dynamic_Programming, Greedy22798.14

Day 5

0053Maximum SubarrayEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer66282.48

Day 6

0152Maximum Product SubarrayMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming25388.42

Day 7

0121Best Time to Buy and Sell StockEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming60994.06

Day 8

Day 9

0139Word BreakMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization19787.17
0042Trapping Rain WaterHardTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack196100.00

Day 10

0091Decode WaysMediumTop_Interview_Questions, String, Dynamic_Programming23776.88

Day 11

0096Unique Binary Search TreesMediumTop_100_Liked_Questions, Dynamic_Programming, Math, Tree, Binary_Tree, Binary_Search_Tree23726.76

Day 12

Day 13

Day 14

Day 15

0062Unique PathsMediumTop_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics20949.18
0063Unique Paths IIMediumArray, Dynamic_Programming, Matrix18784.62

Day 16

0064Minimum Path SumMediumTop_100_Liked_Questions, Array, Dynamic_Programming, Matrix22295.70
0221Maximal SquareMediumTop_100_Liked_Questions, Array, Dynamic_Programming, Matrix61444.00

Day 17

0005Longest Palindromic SubstringMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming32375.48

Day 18

0300Longest Increasing SubsequenceMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search31882.28

Day 19

1143Longest Common SubsequenceMediumTop_100_Liked_Questions, String, Dynamic_Programming30738.36
0072Edit DistanceHardTop_100_Liked_Questions, String, Dynamic_Programming32063.53

Day 20

0322Coin ChangeMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search33250.68

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

0283Move ZeroesEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Two_Pointers51679.07

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

0028Find the Index of the First Occurrence in a StringEasyTop_Interview_Questions, String, Two_Pointers, String_Matching25732.35

Day 2

Day 3

0066Plus OneEasyTop_Interview_Questions, Array, Math30335.18

Day 4

0043Multiply StringsMediumString, Math, Simulation39056.25

Day 5

0067Add BinaryEasyString, Math, Bit_Manipulation, Simulation32732.67

Day 6

0739Daily TemperaturesMediumTop_100_Liked_Questions, Array, Stack, Monotonic_Stack93680.54
0058Length of Last WordEasyString24363.33

Day 7

0048Rotate ImageMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix28746.50

Day 8

0054Spiral MatrixMediumTop_Interview_Questions, Array, Matrix, Simulation22462.50

Day 9

Day 10

Day 11

0049Group AnagramsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting50686.55

Day 12

0438Find All Anagrams in a StringMediumTop_100_Liked_Questions, String, Hash_Table, Sliding_Window56154.68

Day 13

Day 14

0138Copy List with Random PointerMediumTop_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List27480.58

Day 15

0002Add Two NumbersMediumTop_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion41750.44

Day 16

0061Rotate ListMediumTwo_Pointers, Linked_List35513.54

Day 17

Day 18

0155Min StackEasyTop_100_Liked_Questions, Top_Interview_Questions, Stack, Design33184.88

Day 19

Day 20

Graph Theory I

Day 1 Matrix Related Problems

0200Number of IslandsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find25295.41

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

Day 12 Breadth First Search

Day 13 Graph Theory

Day 14 Graph Theory

SQL I

Day 1 Select

Day 2 Select and Order

Day 3 String Processing Functions

Day 4 Union and Select

Day 5 Union

Day 6 Union

Day 7 Function

Day 8 Function

Day 9 Control of Flow

Day 10 Where

Level 1

Day 1 Prefix Sum

Day 2 String

Day 3 Linked List

0021Merge Two Sorted ListsEasyTop_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion14899.90
0206Reverse Linked ListEasyTop_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion30915.90

Day 4 Linked List

0142Linked List Cycle IIMediumTop_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List19263.39

Day 5 Greedy

0121Best Time to Buy and Sell StockEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming60994.06

Day 6 Tree

0102Binary Tree Level Order TraversalMediumTop_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree35529.37

Day 7 Binary Search

Day 8 Binary Search Tree

0098Validate Binary Search TreeMediumTop_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree33041.38

Day 9 Graph/BFS/DFS

0200Number of IslandsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find25295.41

Day 10 Dynamic Programming

0070Climbing StairsEasyTop_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization12797.06

Day 11 Dynamic Programming

0062Unique PathsMediumTop_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics20949.18

Day 12 Sliding Window/Two Pointer

0438Find All Anagrams in a StringMediumTop_100_Liked_Questions, String, Hash_Table, Sliding_Window56154.68

Day 13 Hashmap

0001Two SumEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table23492.75

Day 14 Stack

0394Decode StringMediumTop_100_Liked_Questions, String, Stack, Recursion22464.86

Day 15 Heap

Level 2

Day 1 Implementation/Simulation

0054Spiral MatrixMediumTop_Interview_Questions, Array, Matrix, Simulation22462.50

Day 2 String

0014Longest Common PrefixEasyTop_Interview_Questions, String26948.51
0043Multiply StringsMediumString, Math, Simulation39056.25

Day 3 Linked List

0019Remove Nth Node From End of ListMediumTop_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List17285.17
0234Palindrome Linked ListEasyTop_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Stack, Linked_List, Recursion64179.53

Day 4 Linked List

0148Sort ListMediumTop_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Linked_List, Divide_and_Conquer, Merge_Sort82061.70

Day 5 Greedy

Day 6 Tree

0226Invert Binary TreeEasyTop_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree27513.68

Day 7 Tree

0543Diameter of Binary TreeEasyTop_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree30743.93
0437Path Sum IIIMediumTop_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree40354.12

Day 8 Binary Search

0074Search a 2D MatrixMediumTop_100_Liked_Questions, Array, Binary_Search, Matrix29040.17
0033Search in Rotated Sorted ArrayMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search18486.08

Day 9 Binary Search Tree

0230Kth Smallest Element in a BSTMediumTop_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree39333.33

Day 10 Graph/BFS/DFS

0994Rotting OrangesMediumArray, Breadth_First_Search, Matrix30857.93

Day 11 Graph/BFS/DFS

Day 12 Dynamic Programming

0198House RobberMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming15692.24
0322Coin ChangeMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search33250.68

Day 13 Dynamic Programming

0416Partition Equal Subset SumMediumTop_100_Liked_Questions, Array, Dynamic_Programming50957.56
0152Maximum Product SubarrayMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming25388.42

Day 14 Sliding Window/Two Pointer

0003Longest Substring Without Repeating CharactersMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window25891.09
00163Sum ClosestMediumArray, Sorting, Two_Pointers21989.56
0076Minimum Window SubstringHardTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window34685.20

Day 15 Tree

0101Symmetric TreeEasyTop_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree29026.98
0199Binary Tree Right Side ViewMediumDepth_First_Search, Breadth_First_Search, Tree, Binary_Tree19492.89

Day 16 Design

0155Min StackEasyTop_100_Liked_Questions, Top_Interview_Questions, Stack, Design33184.88
0208Implement Trie (Prefix Tree)MediumTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie68961.00

Day 17 Interval

0057Insert IntervalMediumArray25799.52
0056Merge IntervalsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Sorting32399.68

Day 18 Stack

Day 19 Union Find

Day 20 Brute Force/Backtracking

0039Combination SumMediumTop_100_Liked_Questions, Array, Backtracking31786.85
0046PermutationsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking186100.00

Udemy

Udemy Integers

0136Single NumberEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation34483.63
0007Reverse IntegerMediumTop_Interview_Questions, Math24560.32
0009Palindrome NumberEasyMath23896.24
0050Pow(x, n)MediumTop_Interview_Questions, Math, Recursion26452.98

Udemy Strings

0014Longest Common PrefixEasyTop_Interview_Questions, String26948.51
0003Longest Substring Without Repeating CharactersMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window25891.09
0020Valid ParenthesesEasyTop_100_Liked_Questions, Top_Interview_Questions, String, Stack19671.08
0005Longest Palindromic SubstringMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming32375.48
0394Decode StringMediumTop_100_Liked_Questions, String, Stack, Recursion22464.86
0049Group AnagramsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting50686.55

Udemy Binary Search

0033Search in Rotated Sorted ArrayMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search18486.08
0153Find Minimum in Rotated Sorted ArrayMediumTop_100_Liked_Questions, Array, Binary_Search26260.96

Udemy Arrays

0121Best Time to Buy and Sell StockEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming60994.06
0283Move ZeroesEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Two_Pointers51679.07
0001Two SumEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table23492.75
0058Length of Last WordEasyString24363.33
0080Remove Duplicates from Sorted Array IIMediumArray, Two_Pointers35744.78
0189Rotate ArrayMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers48386.95
0055Jump GameMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy67066.67
0075Sort ColorsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers19885.66
0066Plus OneEasyTop_Interview_Questions, Array, Math30335.18
0238Product of Array Except SelfMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Prefix_Sum66948.96
0041First Missing PositiveHardTop_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table345100.00
0239Sliding Window MaximumHardTop_100_Liked_Questions, Top_Interview_Questions, Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue105986.14

Udemy Two Pointers

0026Remove Duplicates from Sorted ArrayEasyTop_Interview_Questions, Array, Two_Pointers36177.19
0042Trapping Rain WaterHardTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack196100.00
00153SumMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers105955.28

Udemy Famous Algorithm

0053Maximum SubarrayEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer66282.48
0169Majority ElementEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer46051.25

Udemy Sorting Algorithms

Udemy 2D Arrays/Matrix

0074Search a 2D MatrixMediumTop_100_Liked_Questions, Array, Binary_Search, Matrix29040.17
0054Spiral MatrixMediumTop_Interview_Questions, Array, Matrix, Simulation22462.50
0048Rotate ImageMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix28746.50
0073Set Matrix ZeroesMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Matrix255100.00
0056Merge IntervalsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Sorting32399.68

Udemy Linked List

0114Flatten Binary Tree to Linked ListMediumTop_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Linked_List19193.10
0061Rotate ListMediumTwo_Pointers, Linked_List35513.54
0024Swap Nodes in PairsMediumTop_100_Liked_Questions, Linked_List, Recursion14999.39
0142Linked List Cycle IIMediumTop_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List19263.39
0141Linked List CycleEasyTop_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List22391.85
0206Reverse Linked ListEasyTop_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion30915.90
0021Merge Two Sorted ListsEasyTop_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion14899.90
0160Intersection of Two Linked ListsEasyTop_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List26283.50
0234Palindrome Linked ListEasyTop_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Stack, Linked_List, Recursion64179.53
0138Copy List with Random PointerMediumTop_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List27480.58
0025Reverse Nodes in k-GroupHardTop_100_Liked_Questions, Linked_List, Recursion19487.72
0146LRU CacheMediumTop_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Design, Linked_List, Doubly_Linked_List111697.93

Udemy Tree Stack Queue

0094Largest Rectangle in HistogramEasyTop_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack26938.80
0102Binary Tree Level Order TraversalMediumTop_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree35529.37
0543Diameter of Binary TreeEasyTop_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree30743.93
0226Invert Binary TreeEasyTop_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree27513.68
0124Binary Tree Maximum Path SumHardTop_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree33174.42
0098Validate Binary Search TreeMediumTop_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree33041.38
0236Lowest Common Ancestor of a Binary TreeMediumTop_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree38645.21

Udemy Trie and Heap

0208Implement Trie (Prefix Tree)MediumTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie68961.00

Udemy Graph

0200Number of IslandsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find25295.41

Udemy Dynamic Programming

0139Word BreakMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization19787.17
0152Maximum Product SubarrayMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming25388.42
0198House RobberMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming15692.24
0070Climbing StairsEasyTop_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization12797.06
0064Minimum Path SumMediumTop_100_Liked_Questions, Array, Dynamic_Programming, Matrix22295.70
0300Longest Increasing SubsequenceMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search31882.28
1143Longest Common SubsequenceMediumTop_100_Liked_Questions, String, Dynamic_Programming30738.36
0072Edit DistanceHardTop_100_Liked_Questions, String, Dynamic_Programming32063.53
0044Wildcard MatchingHardTop_Interview_Questions, String, Dynamic_Programming, Greedy, Recursion40186.11
0010Regular Expression MatchingHardTop_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Recursion29258.58

Udemy Backtracking/Recursion

0022Generate ParenthesesMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking21078.51
0039Combination SumMediumTop_100_Liked_Questions, Array, Backtracking31786.85
0078SubsetsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking35330.14
0017Letter Combinations of a Phone NumberMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking132100.00
0046PermutationsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking186100.00

Udemy Bit Manipulation

0338Longest Increasing SubsequenceEasyTop_100_Liked_Questions, Dynamic_Programming, Bit_Manipulation18699.26
0029Divide Two IntegersMediumTop_Interview_Questions, Math, Bit_Manipulation28131.67

Udemy Design

0155Min StackEasyTop_100_Liked_Questions, Top_Interview_Questions, Stack, Design33184.88

Data Structure I

Day 1 Array

0053Maximum SubarrayEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer66282.48

Day 2 Array

0001Two SumEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table23492.75
0088Merge Sorted ArrayEasyTop_Interview_Questions, Array, Sorting, Two_Pointers31133.40

Day 3 Array

0121Best Time to Buy and Sell StockEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming60994.06

Day 4 Array

Day 5 Array

0036Valid SudokuMediumTop_Interview_Questions, Array, Hash_Table, Matrix34665.03
0074Search a 2D MatrixMediumTop_100_Liked_Questions, Array, Binary_Search, Matrix29040.17

Day 6 String

Day 7 Linked List

0141Linked List CycleEasyTop_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List22391.85
0021Merge Two Sorted ListsEasyTop_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion14899.90

Day 8 Linked List

0206Reverse Linked ListEasyTop_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion30915.90
0083Remove Duplicates from Sorted ListEasyLinked_List27477.82

Day 9 Stack Queue

0020Valid ParenthesesEasyTop_100_Liked_Questions, Top_Interview_Questions, String, Stack19671.08

Day 10 Tree

0094Largest Rectangle in HistogramEasyTop_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack26938.80

Day 11 Tree

0102Binary Tree Level Order TraversalMediumTop_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree35529.37
0101Symmetric TreeEasyTop_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree29026.98

Day 12 Tree

0226Invert Binary TreeEasyTop_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree27513.68

Day 13 Tree

Day 14 Tree

0098Validate Binary Search TreeMediumTop_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree33041.38

Data Structure II

Day 1 Array

0136Single NumberEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation34483.63
0169Majority ElementEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer46051.25
00153SumMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers105955.28

Day 2 Array

0075Sort ColorsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers19885.66
0056Merge IntervalsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Sorting32399.68

Day 3 Array

0048Rotate ImageMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix28746.50
0059Spiral Matrix IIMediumArray, Matrix, Simulation153100.00

Day 4 Array

0240Search a 2D Matrix IIMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer46066.08

Day 5 Array

0238Product of Array Except SelfMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Prefix_Sum66948.96
0560Subarray Sum Equals KMediumTop_100_Liked_Questions, Array, Hash_Table, Prefix_Sum69253.27

Day 6 String

Day 7 String

0763Partition LabelsMediumTop_100_Liked_Questions, String, Hash_Table, Greedy, Two_Pointers23584.75

Day 8 String

0049Group AnagramsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting50686.55
0043Multiply StringsMediumString, Math, Simulation39056.25

Day 9 String

0005Longest Palindromic SubstringMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming32375.48

Day 10 Linked List

0002Add Two NumbersMediumTop_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion41750.44
0142Linked List Cycle IIMediumTop_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List19263.39

Day 11 Linked List

0160Intersection of Two Linked ListsEasyTop_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List26283.50
0082Remove Duplicates from Sorted List IIMediumTwo_Pointers, Linked_List24191.04

Day 12 Linked List

0024Swap Nodes in PairsMediumTop_100_Liked_Questions, Linked_List, Recursion14999.39

Day 13 Linked List

0025Reverse Nodes in k-GroupHardTop_100_Liked_Questions, Linked_List, Recursion19487.72

Day 14 Stack Queue

0155Min StackEasyTop_100_Liked_Questions, Top_Interview_Questions, Stack, Design33184.88

Day 15 Tree

0105Construct Binary Tree from Preorder and Inorder TraversalMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer37058.31

Day 16 Tree

0199Binary Tree Right Side ViewMediumDepth_First_Search, Breadth_First_Search, Tree, Binary_Tree19492.89

Day 17 Tree

0230Kth Smallest Element in a BSTMediumTop_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree39333.33

Day 18 Tree

0236Lowest Common Ancestor of a Binary TreeMediumTop_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree38645.21

Day 19 Graph

Day 20 Heap Priority Queue

0215Kth Largest Element in an ArrayMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect83934.43
0347Top K Frequent ElementsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Divide_and_Conquer, Quickselect, Bucket_Sort26899.74

Day 21 Heap Priority Queue

Algorithm I

Day 1 Binary Search

0035Search Insert PositionEasyTop_100_Liked_Questions, Array, Binary_Search26750.32

Day 2 Two Pointers

0189Rotate ArrayMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers48386.95

Day 3 Two Pointers

0283Move ZeroesEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Two_Pointers51679.07

Day 4 Two Pointers

Day 5 Two Pointers

0019Remove Nth Node From End of ListMediumTop_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List17285.17

Day 6 Sliding Window

0003Longest Substring Without Repeating CharactersMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window25891.09

Day 7 Breadth First Search Depth First Search

Day 8 Breadth First Search Depth First Search

Day 9 Breadth First Search Depth First Search

0994Rotting OrangesMediumArray, Breadth_First_Search, Matrix30857.93

Day 10 Recursion Backtracking

0021Merge Two Sorted ListsEasyTop_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion14899.90
0206Reverse Linked ListEasyTop_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion30915.90

Day 11 Recursion Backtracking

0077CombinationsMediumBacktracking244100.00
0046PermutationsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking186100.00

Day 12 Dynamic Programming

0070Climbing StairsEasyTop_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization12797.06
0198House RobberMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming15692.24

Day 13 Bit Manipulation

Day 14 Bit Manipulation

0136Single NumberEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation34483.63

Algorithms

#TitleDifficultyTagTime, msTime, %
1143Longest Common SubsequenceMediumTop_100_Liked_Questions, String, Dynamic_Programming, Algorithm_II_Day_17_Dynamic_Programming, Dynamic_Programming_I_Day_19, Udemy_Dynamic_Programming30738.36
0994Rotting OrangesMediumArray, Breadth_First_Search, Matrix, Algorithm_I_Day_9_Breadth_First_Search_Depth_First_Search, Level_2_Day_10_Graph/BFS/DFS30857.93
0864Shortest Path to Get All KeysHardBreadth_First_Search, Bit_Manipulation176100.00
0763Partition LabelsMediumTop_100_Liked_Questions, String, Hash_Table, Greedy, Two_Pointers, Data_Structure_II_Day_7_String23584.75
0739Daily TemperaturesMediumTop_100_Liked_Questions, Array, Stack, Monotonic_Stack, Programming_Skills_II_Day_693680.54
0647Palindromic SubstringsMediumTop_100_Liked_Questions, String, Dynamic_Programming26667.83
0560Subarray Sum Equals KMediumTop_100_Liked_Questions, Array, Hash_Table, Prefix_Sum, Data_Structure_II_Day_5_Array69253.27
0543Diameter of Binary TreeEasyTop_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Level_2_Day_7_Tree, Udemy_Tree_Stack_Queue30743.93
0494Target SumMediumTop_100_Liked_Questions, Array, Dynamic_Programming, Backtracking30889.61
0438Find All Anagrams in a StringMediumTop_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_Pointer56154.68
0437Path Sum IIIMediumTop_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Level_2_Day_7_Tree40354.12
0416Partition Equal Subset SumMediumTop_100_Liked_Questions, Array, Dynamic_Programming, Level_2_Day_13_Dynamic_Programming50957.56
0394Decode StringMediumTop_100_Liked_Questions, String, Stack, Recursion, Level_1_Day_14_Stack, Udemy_Strings22464.86
0378Kth Smallest Element in a Sorted MatrixMediumTop_Interview_Questions, Array, Sorting, Binary_Search, Matrix, Heap_Priority_Queue52259.78
0347Top K Frequent ElementsMediumTop_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_Queue26899.74
0338Longest Increasing SubsequenceEasyTop_100_Liked_Questions, Dynamic_Programming, Bit_Manipulation, Udemy_Bit_Manipulation18699.26
0322Coin ChangeMediumTop_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_Programming33250.68
0300Longest Increasing SubsequenceMediumTop_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_Programming31882.28
0295Find Median from Data StreamHardTop_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Design, Heap_Priority_Queue, Data_Stream228933.60
0287Find the Duplicate NumberMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Two_Pointers, Bit_Manipulation, Binary_Search_II_Day_565666.21
0283Move ZeroesEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Two_Pointers, Algorithm_I_Day_3_Two_Pointers, Programming_Skills_I_Day_6_Array, Udemy_Arrays51679.07
0240Search a 2D Matrix IIMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer, Data_Structure_II_Day_4_Array, Binary_Search_II_Day_846066.08
0239Sliding Window MaximumHardTop_100_Liked_Questions, Top_Interview_Questions, Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue, Udemy_Arrays105986.14
0238Product of Array Except SelfMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Prefix_Sum, Data_Structure_II_Day_5_Array, Udemy_Arrays66948.96
0236Lowest Common Ancestor of a Binary TreeMediumTop_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_18_Tree, Udemy_Tree_Stack_Queue38645.21
0234Palindrome Linked ListEasyTop_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Stack, Linked_List, Recursion, Level_2_Day_3_Linked_List, Udemy_Linked_List64179.53
0230Kth Smallest Element in a BSTMediumTop_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_Tree39333.33
0226Invert Binary TreeEasyTop_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_Queue27513.68
0221Maximal SquareMediumTop_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_1661444.00
0215Kth Largest Element in an ArrayMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect, Data_Structure_II_Day_20_Heap_Priority_Queue83934.43
0208Implement Trie (Prefix Tree)MediumTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie, Level_2_Day_16_Design, Udemy_Trie_and_Heap68961.00
0207Course ScheduleMediumTop_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort41640.10
0206Reverse Linked ListEasyTop_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_List30915.90
0200Number of IslandsMediumTop_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_Graph25295.41
0199Binary Tree Right Side ViewMediumDepth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_16_Tree, Level_2_Day_15_Tree19492.89
0198House RobberMediumTop_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_Programming15692.24
0189Rotate ArrayMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers, Algorithm_I_Day_2_Two_Pointers, Udemy_Arrays48386.95
0169Majority ElementEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer, Data_Structure_II_Day_1_Array, Udemy_Famous_Algorithm46051.25
0160Intersection of Two Linked ListsEasyTop_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_II_Day_11_Linked_List, Udemy_Linked_List26283.50
0155Min StackEasyTop_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_Design33184.88
0153Find Minimum in Rotated Sorted ArrayMediumTop_100_Liked_Questions, Array, Binary_Search, Algorithm_II_Day_2_Binary_Search, Binary_Search_I_Day_12, Udemy_Binary_Search26260.96
0152Maximum Product SubarrayMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Dynamic_Programming_I_Day_6, Level_2_Day_13_Dynamic_Programming, Udemy_Dynamic_Programming25388.42
0148Sort ListMediumTop_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Linked_List, Divide_and_Conquer, Merge_Sort, Level_2_Day_4_Linked_List82061.70
0146LRU CacheMediumTop_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Design, Linked_List, Doubly_Linked_List, Udemy_Linked_List111697.93
0142Linked List Cycle IIMediumTop_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_II_Day_10_Linked_List, Level_1_Day_4_Linked_List, Udemy_Linked_List19263.39
0141Linked List CycleEasyTop_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_I_Day_7_Linked_List, Udemy_Linked_List22391.85
0139Word BreakMediumTop_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_Programming19787.17
0138Copy List with Random PointerMediumTop_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List, Programming_Skills_II_Day_14, Udemy_Linked_List27480.58
0136Single NumberEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Data_Structure_II_Day_1_Array, Algorithm_I_Day_14_Bit_Manipulation, Udemy_Integers34483.63
0131Palindrome PartitioningMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking82087.27
0128Longest Consecutive SequenceMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Union_Find46097.77
0124Binary Tree Maximum Path SumHardTop_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Udemy_Tree_Stack_Queue33174.42
0121Best Time to Buy and Sell StockEasyTop_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_Arrays60994.06
0114Flatten Binary Tree to Linked ListMediumTop_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Linked_List, Udemy_Linked_List19193.10
0105Construct Binary Tree from Preorder and Inorder TraversalMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer, Data_Structure_II_Day_15_Tree37058.31
0102Binary Tree Level Order TraversalMediumTop_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_Queue35529.37
0101Symmetric TreeEasyTop_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_Tree29026.98
0098Validate Binary Search TreeMediumTop_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_Queue33041.38
0097Interleaving StringMediumString, Dynamic_Programming24057.50
0096Unique Binary Search TreesMediumTop_100_Liked_Questions, Dynamic_Programming, Math, Tree, Binary_Tree, Binary_Search_Tree, Dynamic_Programming_I_Day_1123726.76
0095Unique Binary Search Trees IIMediumDynamic_Programming, Tree, Binary_Tree, Backtracking, Binary_Search_Tree36041.38
0094Largest Rectangle in HistogramEasyTop_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree, Udemy_Tree_Stack_Queue26938.80
0093Restore IP AddressesMediumString, Backtracking30473.33
0092Reverse Linked List IIMediumLinked_List19182.35
0091Decode WaysMediumTop_Interview_Questions, String, Dynamic_Programming, Algorithm_II_Day_15_Dynamic_Programming, Dynamic_Programming_I_Day_1023776.88
0090Subsets IIMediumArray, Bit_Manipulation, Backtracking, Algorithm_II_Day_9_Recursion_Backtracking36658.09
0089Gray CodeMediumMath, Bit_Manipulation, Backtracking273100.00
0088Merge Sorted ArrayEasyTop_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_I_Day_2_Array31133.40
0087Partition ListHardString, Dynamic_Programming36685.00
0086Partition ListMediumTwo_Pointers, Linked_List3315.88
0085Maximal RectangleHardArray, Dynamic_Programming, Matrix, Stack, Monotonic_Stack46355.17
0084Largest Rectangle in HistogramHardTop_100_Liked_Questions, Top_Interview_Questions, Array, Stack, Monotonic_Stack525100.00
0083Remove Duplicates from Sorted ListEasyLinked_List, Data_Structure_I_Day_8_Linked_List27477.82
0082Remove Duplicates from Sorted List IIMediumTwo_Pointers, Linked_List, Data_Structure_II_Day_11_Linked_List, Algorithm_II_Day_3_Two_Pointers24191.04
0081Search in Rotated Sorted Array IIMediumArray, Binary_Search, Binary_Search_II_Day_1235242.31
0080Remove Duplicates from Sorted Array IIMediumArray, Two_Pointers, Udemy_Arrays35744.78
0079Word SearchMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking46368.49
0078SubsetsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Algorithm_II_Day_9_Recursion_Backtracking, Udemy_Backtracking/Recursion35330.14
0077CombinationsMediumBacktracking, Algorithm_I_Day_11_Recursion_Backtracking244100.00
0076Minimum Window SubstringHardTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Level_2_Day_14_Sliding_Window/Two_Pointer34685.20
0075Sort ColorsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_II_Day_2_Array, Udemy_Arrays19885.66
0074Search a 2D MatrixMediumTop_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/Matrix29040.17
0073Set Matrix ZeroesMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Matrix, Udemy_2D_Arrays/Matrix255100.00
0072Edit DistanceHardTop_100_Liked_Questions, String, Dynamic_Programming, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_19, Udemy_Dynamic_Programming32063.53
0071Simplify PathMediumString, Stack31864.44
0070Climbing StairsEasyTop_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_Programming12797.06
0069Sqrt(x)EasyTop_Interview_Questions, Math, Binary_Search, Binary_Search_I_Day_415395.75
0068Text JustificationHardArray, String, Simulation26950.00
0067Add BinaryEasyString, Math, Bit_Manipulation, Simulation, Programming_Skills_II_Day_532732.67
0066Plus OneEasyTop_Interview_Questions, Array, Math, Programming_Skills_II_Day_3, Udemy_Arrays30335.18
0065Valid NumberHardString31081.82
0064Minimum Path SumMediumTop_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_16, Udemy_Dynamic_Programming22295.70
0063Unique Paths IIMediumArray, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_1518784.62
0062Unique PathsMediumTop_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_Programming20949.18
0061Rotate ListMediumTwo_Pointers, Linked_List, Programming_Skills_II_Day_16, Udemy_Linked_List35513.54
0060Permutation SequenceHardMath, Recursion29327.78
0059Spiral Matrix IIMediumArray, Matrix, Simulation, Data_Structure_II_Day_3_Array153100.00
0058Length of Last WordEasyString, Programming_Skills_II_Day_6, Udemy_Arrays24363.33
0057Insert IntervalMediumArray, Level_2_Day_17_Interval25799.52
0056Merge IntervalsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Data_Structure_II_Day_2_Array, Level_2_Day_17_Interval, Udemy_2D_Arrays/Matrix32399.68
0055Jump GameMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Algorithm_II_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_4, Udemy_Arrays67066.67
0054Spiral MatrixMediumTop_Interview_Questions, Array, Matrix, Simulation, Programming_Skills_II_Day_8, Level_2_Day_1_Implementation/Simulation, Udemy_2D_Arrays/Matrix22462.50
0053Maximum SubarrayEasyTop_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_Algorithm66282.48
0052N-Queens IIHardBacktracking23180.00
0051N-QueensHardTop_100_Liked_Questions, Array, Backtracking24395.10
0050Pow(x, n)MediumTop_Interview_Questions, Math, Recursion, Udemy_Integers26452.98
0049Group AnagramsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Data_Structure_II_Day_8_String, Programming_Skills_II_Day_11, Udemy_Strings50686.55
0048Rotate ImageMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Data_Structure_II_Day_3_Array, Programming_Skills_II_Day_7, Udemy_2D_Arrays/Matrix28746.50
0047Permutations IIMediumArray, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking40676.36
0046PermutationsMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Algorithm_I_Day_11_Recursion_Backtracking, Level_2_Day_20_Brute_Force/Backtracking, Udemy_Backtracking/Recursion186100.00
0045Jump Game IIMediumTop_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Algorithm_II_Day_13_Dynamic_Programming, Dynamic_Programming_I_Day_422798.14
0044Wildcard MatchingHardTop_Interview_Questions, String, Dynamic_Programming, Greedy, Recursion, Udemy_Dynamic_Programming40186.11
0043Multiply StringsMediumString, Math, Simulation, Data_Structure_II_Day_8_String, Programming_Skills_II_Day_4, Level_2_Day_2_String39056.25
0042Trapping Rain WaterHardTop_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack, Dynamic_Programming_I_Day_9, Udemy_Two_Pointers196100.00
0041First Missing PositiveHardTop_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Udemy_Arrays345100.00
0040Combination Sum IIMediumArray, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking34880.92
0039Combination SumMediumTop_100_Liked_Questions, Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking, Level_2_Day_20_Brute_Force/Backtracking, Udemy_Backtracking/Recursion31786.85
0038Count and SayMediumTop_Interview_Questions, String31741.11
0037Sudoku SolverHardArray, Matrix, Backtracking29479.69
0036Valid SudokuMediumTop_Interview_Questions, Array, Hash_Table, Matrix, Data_Structure_I_Day_5_Array34665.03
0035Search Insert PositionEasyTop_100_Liked_Questions, Array, Binary_Search, Algorithm_I_Day_1_Binary_Search, Binary_Search_I_Day_226750.32
0034Find First and Last Position of Element in Sorted ArrayMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_522883.38
0033Search in Rotated Sorted ArrayMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_1_Binary_Search18486.08
0032Longest Valid ParenthesesHardTop_100_Liked_Questions, String, Dynamic_Programming, Stack21595.71
0031Next PermutationMediumTop_100_Liked_Questions, Array, Two_Pointers21194.23
0030Substring with Concatenation of All WordsHardString, Hash_Table, Sliding_Window44185.84
0029Divide Two IntegersMediumTop_Interview_Questions, Math, Bit_Manipulation, Udemy_Bit_Manipulation28131.67
0028Find the Index of the First Occurrence in a StringEasyTop_Interview_Questions, String, Two_Pointers, String_Matching, Programming_Skills_II_Day_125732.35
0027Remove ElementEasyArray, Two_Pointers29332.19
0026Remove Duplicates from Sorted ArrayEasyTop_Interview_Questions, Array, Two_Pointers36177.19
0025Reverse Nodes in k-GroupHardTop_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_13_Linked_List19487.72
0024Swap Nodes in PairsMediumTop_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_12_Linked_List, Udemy_Linked_List14999.39
0023Merge k Sorted ListsHardTop_100_Liked_Questions, Top_Interview_Questions, Heap_Priority_Queue, Linked_List, Divide_and_Conquer, Merge_Sort32375.14
0022Generate ParenthesesMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking21078.51
0021Merge Two Sorted ListsEasyTop_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Data_Structure_I_Day_7_Linked_List, Algorithm_I_Day_10_Recursion_Backtracking14899.90
0020Valid ParenthesesEasyTop_100_Liked_Questions, Top_Interview_Questions, String, Stack, Data_Structure_I_Day_9_Stack_Queue19671.08
0019Remove Nth Node From End of ListMediumTop_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Algorithm_I_Day_5_Two_Pointers17285.17
00184SumMediumArray, Sorting, Two_Pointers46781.25
0017Letter Combinations of a Phone NumberMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking132100.00
00163Sum ClosestMediumArray, Sorting, Two_Pointers21989.56
00153SumMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_II_Day_1_Array, Algorithm_II_Day_3_Two_Pointers105955.28
0014Longest Common PrefixEasyTop_Interview_Questions, String26948.51
0013Roman to IntegerEasyTop_Interview_Questions, String, Hash_Table, Math29378.06
0012Integer to RomanMediumString, Hash_Table, Math30072.89
0011Container With Most WaterMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers, Algorithm_II_Day_4_Two_Pointers47489.18
0010Regular Expression MatchingHardTop_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Recursion, Udemy_Dynamic_Programming29258.58
0009Palindrome NumberEasyMath, Udemy_Integers23896.24
0008String to Integer (atoi)MediumTop_Interview_Questions, String19696.46
0007Reverse IntegerMediumTop_Interview_Questions, Math, Udemy_Integers24560.32
0006Zigzag ConversionMediumString36680.62
0005Longest Palindromic SubstringMediumTop_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_Strings32375.48
0004Median of Two Sorted ArraysHardTop_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Divide_and_Conquer35583.48
0003Longest Substring Without Repeating CharactersMediumTop_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_Strings25891.09
0002Add Two NumbersMediumTop_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Data_Structure_II_Day_10_Linked_List, Programming_Skills_II_Day_1541750.44
0001Two SumEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Data_Structure_I_Day_2_Array, Level_1_Day_13_Hashmap, Udemy_Arrays23492.75

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