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Ruby-based LeetCode algorithm problem solutions, regularly updated.

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LeetCode-in-Ruby/LeetCode-in-Ruby.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

Day 2 Binary Search

Day 3 Two Pointers

00153SumMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n*log(n))_Space_O(n^2)65983.74

Day 4 Two Pointers

0011Container With Most WaterMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers, Big_O_Time_O(n)_Space_O(1)11495.98

Day 5 Sliding Window

Day 6 Breadth First Search Depth First Search

Day 7 Breadth First Search Depth First Search

Day 8 Breadth First Search Depth First Search

Day 9 Recursion Backtracking

Day 10 Recursion Backtracking

Day 11 Recursion Backtracking

0017Letter Combinations of a Phone NumberMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Big_O_Time_O(4^n)_Space_O(n)4993.94
0022Generate ParenthesesMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Big_O_Time_O(2^n)_Space_O(n)43100.00

Day 12 Dynamic Programming

Day 13 Dynamic Programming

Day 14 Dynamic Programming

0005Longest Palindromic SubstringMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)11798.63

Day 15 Dynamic Programming

Day 16 Dynamic Programming

Day 17 Dynamic Programming

Day 18 Dynamic Programming

Day 19 Bit Manipulation

Day 20 Others

Day 21 Others

Binary Search 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

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

0005Longest Palindromic SubstringMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)11798.63

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

0002Add Two NumbersMediumTop_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Big_O_Time_O(max(N,M))_Space_O(max(N,M))6897.48

Day 16

Day 17

Day 18

Day 19

Day 20

Graph Theory I

Day 1 Matrix Related Problems

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, Recursion, Big_O_Time_O(m+n)_Space_O(m+n)6659.01

Day 4 Linked List

Day 5 Greedy

Day 6 Tree

Day 7 Binary Search

Day 8 Binary Search Tree

Day 9 Graph/BFS/DFS

Day 10 Dynamic Programming

Day 11 Dynamic Programming

Day 12 Sliding Window/Two Pointer

Day 13 Hashmap

0001Two SumEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n)5789.38

Day 14 Stack

Day 15 Heap

Level 2

Day 1 Implementation/Simulation

Day 2 String

Day 3 Linked List

0019Remove Nth Node From End of ListMediumTop_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Big_O_Time_O(L)_Space_O(L)5195.27

Day 4 Linked List

Day 5 Greedy

Day 6 Tree

Day 7 Tree

Day 8 Binary Search

Day 9 Binary Search Tree

Day 10 Graph/BFS/DFS

Day 11 Graph/BFS/DFS

Day 12 Dynamic Programming

Day 13 Dynamic Programming

Day 14 Sliding Window/Two Pointer

0003Longest Substring Without Repeating CharactersMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n)_Space_O(1)9485.62

Day 15 Tree

Day 16 Design

Day 17 Interval

Day 18 Stack

Day 19 Union Find

Day 20 Brute Force/Backtracking

Udemy

Udemy Integers

0007Reverse IntegerMediumTop_Interview_Questions, Math5875.27
0009Palindrome NumberEasyMath8374.19

Udemy Strings

0003Longest Substring Without Repeating CharactersMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n)_Space_O(1)9485.62
0020Valid ParenthesesEasyTop_100_Liked_Questions, Top_Interview_Questions, String, Stack, Big_O_Time_O(n)_Space_O(n)5390.52
0005Longest Palindromic SubstringMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)11798.63

Udemy Binary Search

Udemy Arrays

0001Two SumEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n)5789.38

Udemy Two Pointers

00153SumMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n*log(n))_Space_O(n^2)65983.74

Udemy Famous Algorithm

Udemy Sorting Algorithms

Udemy 2D Arrays/Matrix

Udemy Linked List

0024Swap Nodes in PairsMediumTop_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(1)5976.00
0021Merge Two Sorted ListsEasyTop_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n)6659.01
0025Reverse Nodes in k-GroupHardTop_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(k)6291.67

Udemy Tree Stack Queue

Udemy Trie and Heap

Udemy Graph

Udemy Dynamic Programming

0010Regular Expression MatchingHardTop_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Recursion, Big_O_Time_O(m*n)_Space_O(m*n)6694.44

Udemy Backtracking/Recursion

0022Generate ParenthesesMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Big_O_Time_O(2^n)_Space_O(n)43100.00
0017Letter Combinations of a Phone NumberMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Big_O_Time_O(4^n)_Space_O(n)4993.94

Udemy Bit Manipulation

Udemy Design

Data Structure I

Day 1 Array

Day 2 Array

0001Two SumEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n)5789.38

Day 3 Array

Day 4 Array

Day 5 Array

Day 6 String

Day 7 Linked List

0021Merge Two Sorted ListsEasyTop_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n)6659.01

Day 8 Linked List

Day 9 Stack Queue

0020Valid ParenthesesEasyTop_100_Liked_Questions, Top_Interview_Questions, String, Stack, Big_O_Time_O(n)_Space_O(n)5390.52

Day 10 Tree

Day 11 Tree

Day 12 Tree

Day 13 Tree

Day 14 Tree

Data Structure II

Day 1 Array

00153SumMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n*log(n))_Space_O(n^2)65983.74

Day 2 Array

Day 3 Array

Day 4 Array

Day 5 Array

Day 6 String

Day 7 String

Day 8 String

Day 9 String

0005Longest Palindromic SubstringMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)11798.63

Day 10 Linked List

0002Add Two NumbersMediumTop_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Big_O_Time_O(max(N,M))_Space_O(max(N,M))6897.48

Day 11 Linked List

Day 12 Linked List

0024Swap Nodes in PairsMediumTop_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(1)5976.00

Day 13 Linked List

0025Reverse Nodes in k-GroupHardTop_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(k)6291.67

Day 14 Stack Queue

Day 15 Tree

Day 16 Tree

Day 17 Tree

Day 18 Tree

Day 19 Graph

Day 20 Heap Priority Queue

Day 21 Heap Priority Queue

Algorithm I

Day 1 Binary Search

Day 2 Two Pointers

Day 3 Two Pointers

Day 4 Two Pointers

Day 5 Two Pointers

0019Remove Nth Node From End of ListMediumTop_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Big_O_Time_O(L)_Space_O(L)5195.27

Day 6 Sliding Window

0003Longest Substring Without Repeating CharactersMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n)_Space_O(1)9485.62

Day 7 Breadth First Search Depth First Search

Day 8 Breadth First Search Depth First Search

Day 9 Breadth First Search Depth First Search

Day 10 Recursion Backtracking

0021Merge Two Sorted ListsEasyTop_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n)6659.01

Day 11 Recursion Backtracking

Day 12 Dynamic Programming

Day 13 Bit Manipulation

Day 14 Bit Manipulation

Algorithms

#TitleDifficultyTagTime, msTime, %
0025Reverse Nodes in k-GroupHardTop_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_13_Linked_List, Udemy_Linked_List, Big_O_Time_O(n)_Space_O(k)6291.67
0024Swap Nodes in PairsMediumTop_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_12_Linked_List, Udemy_Linked_List, Big_O_Time_O(n)_Space_O(1)5976.00
0023Merge k Sorted ListsHardTop_100_Liked_Questions, Top_Interview_Questions, Heap_Priority_Queue, Linked_List, Divide_and_Conquer, Merge_Sort, Big_O_Time_O(k*n*log(k))_Space_O(log(k))7687.95
0022Generate ParenthesesMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(2^n)_Space_O(n)43100.00
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_Backtracking, Level_1_Day_3_Linked_List, Udemy_Linked_List, Big_O_Time_O(m+n)_Space_O(m+n)6659.01
0020Valid ParenthesesEasyTop_100_Liked_Questions, Top_Interview_Questions, String, Stack, Data_Structure_I_Day_9_Stack_Queue, Udemy_Strings, Big_O_Time_O(n)_Space_O(n)5390.52
0019Remove Nth Node From End of ListMediumTop_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Algorithm_I_Day_5_Two_Pointers, Level_2_Day_3_Linked_List, Big_O_Time_O(L)_Space_O(L)5195.27
0017Letter Combinations of a Phone NumberMediumTop_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(4^n)_Space_O(n)4993.94
00153SumMediumTop_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, Big_O_Time_O(n*log(n))_Space_O(n^2)65983.74
0011Container With Most WaterMediumTop_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers, Algorithm_II_Day_4_Two_Pointers, Big_O_Time_O(n)_Space_O(1)11495.98
0010Regular Expression MatchingHardTop_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Recursion, Udemy_Dynamic_Programming, Big_O_Time_O(m*n)_Space_O(m*n)6694.44
0009Palindrome NumberEasyMath, Udemy_Integers8374.19
0008String to Integer (atoi)MediumTop_Interview_Questions, String6767.26
0007Reverse IntegerMediumTop_Interview_Questions, Math, Udemy_Integers5875.27
0006Zigzag ConversionMediumString77100.00
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_Strings, Big_O_Time_O(n)_Space_O(n)11798.63
0004Median of Two Sorted ArraysHardTop_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Divide_and_Conquer, Big_O_Time_O(log(min(N,M)))_Space_O(1)6493.81
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_Strings, Big_O_Time_O(n)_Space_O(1)9485.62
0002Add Two NumbersMediumTop_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Data_Structure_II_Day_10_Linked_List, Programming_Skills_II_Day_15, Big_O_Time_O(max(N,M))_Space_O(max(N,M))6897.48
0001Two SumEasyTop_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Data_Structure_I_Day_2_Array, Level_1_Day_13_Hashmap, Udemy_Arrays, Big_O_Time_O(n)_Space_O(n)5789.38

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