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Title: GitHub - pytdev/LeetCode-in-Ruby: Ruby-based LeetCode algorithm problem solutions, regularly updated. · GitHub

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Description: Ruby-based LeetCode algorithm problem solutions, regularly updated. - pytdev/LeetCode-in-Ruby

Open Graph Description: Ruby-based LeetCode algorithm problem solutions, regularly updated. - pytdev/LeetCode-in-Ruby

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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."	https://www.quora.com/How-effective-is-Leetcode-for-preparing-for-technical-interviews
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	https://github.com/pytdev/LeetCode-in-Ruby#day-2-binary-search
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3Sum	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0015_3sum/solution.rb
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Container With Most Water	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0011_container_with_most_water/solution.rb
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Subsets	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0078_subsets/solution.rb
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	https://github.com/pytdev/LeetCode-in-Ruby#day-17-1
Longest Palindromic Substring	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0005_longest_palindromic_substring/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-18-1
	https://github.com/pytdev/LeetCode-in-Ruby#day-19-1
Edit Distance	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0072_edit_distance/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-20-1
	https://github.com/pytdev/LeetCode-in-Ruby#day-21
	https://github.com/pytdev/LeetCode-in-Ruby#programming-skills-i
	https://github.com/pytdev/LeetCode-in-Ruby#day-1-basic-data-type
	https://github.com/pytdev/LeetCode-in-Ruby#day-2-operator
	https://github.com/pytdev/LeetCode-in-Ruby#day-3-conditional-statements
	https://github.com/pytdev/LeetCode-in-Ruby#day-4-loop
	https://github.com/pytdev/LeetCode-in-Ruby#day-5-function
	https://github.com/pytdev/LeetCode-in-Ruby#day-6-array
	https://github.com/pytdev/LeetCode-in-Ruby#day-7-array
	https://github.com/pytdev/LeetCode-in-Ruby#day-8-string
	https://github.com/pytdev/LeetCode-in-Ruby#day-9-string
	https://github.com/pytdev/LeetCode-in-Ruby#day-10-linked-list-and-tree
Maximum Depth of Binary Tree	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0104_maximum_depth_of_binary_tree/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-11-containers-and-libraries
	https://github.com/pytdev/LeetCode-in-Ruby#day-12-class-and-object
	https://github.com/pytdev/LeetCode-in-Ruby#programming-skills-ii
	https://github.com/pytdev/LeetCode-in-Ruby#day-1-3
	https://github.com/pytdev/LeetCode-in-Ruby#day-2-3
	https://github.com/pytdev/LeetCode-in-Ruby#day-3-3
	https://github.com/pytdev/LeetCode-in-Ruby#day-4-3
	https://github.com/pytdev/LeetCode-in-Ruby#day-5-3
	https://github.com/pytdev/LeetCode-in-Ruby#day-6-3
	https://github.com/pytdev/LeetCode-in-Ruby#day-7-3
Rotate Image	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0048_rotate_image/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-8-3
	https://github.com/pytdev/LeetCode-in-Ruby#day-9-3
	https://github.com/pytdev/LeetCode-in-Ruby#day-10-3
	https://github.com/pytdev/LeetCode-in-Ruby#day-11-3
Group Anagrams	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0049_group_anagrams/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-12-3
	https://github.com/pytdev/LeetCode-in-Ruby#day-13-2
	https://github.com/pytdev/LeetCode-in-Ruby#day-14-2
	https://github.com/pytdev/LeetCode-in-Ruby#day-15-2
Add Two Numbers	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0002_add_two_numbers/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-16-2
	https://github.com/pytdev/LeetCode-in-Ruby#day-17-2
	https://github.com/pytdev/LeetCode-in-Ruby#day-18-2
	https://github.com/pytdev/LeetCode-in-Ruby#day-19-2
	https://github.com/pytdev/LeetCode-in-Ruby#day-20-2
	https://github.com/pytdev/LeetCode-in-Ruby#graph-theory-i
	https://github.com/pytdev/LeetCode-in-Ruby#day-1-matrix-related-problems
	https://github.com/pytdev/LeetCode-in-Ruby#day-2-matrix-related-problems
	https://github.com/pytdev/LeetCode-in-Ruby#day-3-matrix-related-problems
	https://github.com/pytdev/LeetCode-in-Ruby#day-4-matrix-related-problems
	https://github.com/pytdev/LeetCode-in-Ruby#day-5-matrix-related-problems
	https://github.com/pytdev/LeetCode-in-Ruby#day-6-matrix-related-problems
	https://github.com/pytdev/LeetCode-in-Ruby#day-7-standard-traversal
	https://github.com/pytdev/LeetCode-in-Ruby#day-8-standard-traversal
	https://github.com/pytdev/LeetCode-in-Ruby#day-9-standard-traversal
	https://github.com/pytdev/LeetCode-in-Ruby#day-10-standard-traversal
	https://github.com/pytdev/LeetCode-in-Ruby#day-11-breadth-first-search
	https://github.com/pytdev/LeetCode-in-Ruby#day-12-breadth-first-search
	https://github.com/pytdev/LeetCode-in-Ruby#day-13-graph-theory
	https://github.com/pytdev/LeetCode-in-Ruby#day-14-graph-theory
	https://github.com/pytdev/LeetCode-in-Ruby#sql-i
	https://github.com/pytdev/LeetCode-in-Ruby#day-1-select
	https://github.com/pytdev/LeetCode-in-Ruby#day-2-select-and-order
	https://github.com/pytdev/LeetCode-in-Ruby#day-3-string-processing-functions
	https://github.com/pytdev/LeetCode-in-Ruby#day-4-union-and-select
	https://github.com/pytdev/LeetCode-in-Ruby#day-5-union
	https://github.com/pytdev/LeetCode-in-Ruby#day-6-union
	https://github.com/pytdev/LeetCode-in-Ruby#day-7-function
	https://github.com/pytdev/LeetCode-in-Ruby#day-8-function
	https://github.com/pytdev/LeetCode-in-Ruby#day-9-control-of-flow
	https://github.com/pytdev/LeetCode-in-Ruby#day-10-where
	https://github.com/pytdev/LeetCode-in-Ruby#level-1
	https://github.com/pytdev/LeetCode-in-Ruby#day-1-prefix-sum
	https://github.com/pytdev/LeetCode-in-Ruby#day-2-string
	https://github.com/pytdev/LeetCode-in-Ruby#day-3-linked-list
Merge Two Sorted Lists	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0021_merge_two_sorted_lists/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-4-linked-list
	https://github.com/pytdev/LeetCode-in-Ruby#day-5-greedy
Best Time to Buy and Sell Stock	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0121_best_time_to_buy_and_sell_stock/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-6-tree
Binary Tree Level Order Traversal	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0102_binary_tree_level_order_traversal/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-7-binary-search
	https://github.com/pytdev/LeetCode-in-Ruby#day-8-binary-search-tree
Validate Binary Search Tree	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0098_validate_binary_search_tree/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-9-graphbfsdfs
	https://github.com/pytdev/LeetCode-in-Ruby#day-10-dynamic-programming
Climbing Stairs	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0070_climbing_stairs/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-11-dynamic-programming
Unique Paths	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0062_unique_paths/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-12-sliding-windowtwo-pointer
	https://github.com/pytdev/LeetCode-in-Ruby#day-13-hashmap
Two Sum	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0001_two_sum/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-14-stack
	https://github.com/pytdev/LeetCode-in-Ruby#day-15-heap
	https://github.com/pytdev/LeetCode-in-Ruby#level-2
	https://github.com/pytdev/LeetCode-in-Ruby#day-1-implementationsimulation
	https://github.com/pytdev/LeetCode-in-Ruby#day-2-string-1
	https://github.com/pytdev/LeetCode-in-Ruby#day-3-linked-list-1
Remove Nth Node From End of List	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0019_remove_nth_node_from_end_of_list/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-4-linked-list-1
	https://github.com/pytdev/LeetCode-in-Ruby#day-5-greedy-1
	https://github.com/pytdev/LeetCode-in-Ruby#day-6-tree-1
	https://github.com/pytdev/LeetCode-in-Ruby#day-7-tree
	https://github.com/pytdev/LeetCode-in-Ruby#day-8-binary-search
Search a 2D Matrix	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0074_search_a_2d_matrix/solution.rb
Search in Rotated Sorted Array	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0033_search_in_rotated_sorted_array/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-9-binary-search-tree
	https://github.com/pytdev/LeetCode-in-Ruby#day-10-graphbfsdfs
	https://github.com/pytdev/LeetCode-in-Ruby#day-11-graphbfsdfs
	https://github.com/pytdev/LeetCode-in-Ruby#day-12-dynamic-programming-1
	https://github.com/pytdev/LeetCode-in-Ruby#day-13-dynamic-programming-1
	https://github.com/pytdev/LeetCode-in-Ruby#day-14-sliding-windowtwo-pointer
Longest Substring Without Repeating Characters	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0003_longest_substring_without_repeating_characters/solution.rb
Minimum Window Substring	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0076_minimum_window_substring/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-15-tree
Symmetric Tree	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0101_symmetric_tree/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-16-design
	https://github.com/pytdev/LeetCode-in-Ruby#day-17-interval
Merge Intervals	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0056_merge_intervals/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-18-stack
	https://github.com/pytdev/LeetCode-in-Ruby#day-19-union-find
	https://github.com/pytdev/LeetCode-in-Ruby#day-20-brute-forcebacktracking
Combination Sum	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0039_combination_sum/solution.rb
Permutations	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0046_permutations/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#udemy
	https://github.com/pytdev/LeetCode-in-Ruby#udemy-integers
Single Number	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0136_single_number/solution.rb
Reverse Integer	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0007_reverse_integer/solution.rb
Palindrome Number	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0009_palindrome_number/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#udemy-strings
Longest Substring Without Repeating Characters	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0003_longest_substring_without_repeating_characters/solution.rb
Valid Parentheses	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0020_valid_parentheses/solution.rb
Longest Palindromic Substring	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0005_longest_palindromic_substring/solution.rb
Group Anagrams	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0049_group_anagrams/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#udemy-binary-search
Search in Rotated Sorted Array	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0033_search_in_rotated_sorted_array/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#udemy-arrays
Best Time to Buy and Sell Stock	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0121_best_time_to_buy_and_sell_stock/solution.rb
Two Sum	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0001_two_sum/solution.rb
Jump Game	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0055_jump_game/solution.rb
Sort Colors	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0075_sort_colors/solution.rb
First Missing Positive	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0041_first_missing_positive/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#udemy-two-pointers
Trapping Rain Water	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0042_trapping_rain_water/solution.rb
3Sum	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0015_3sum/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#udemy-famous-algorithm
Maximum Subarray	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0053_maximum_subarray/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#udemy-sorting-algorithms
	https://github.com/pytdev/LeetCode-in-Ruby#udemy-2d-arraysmatrix
Search a 2D Matrix	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0074_search_a_2d_matrix/solution.rb
Rotate Image	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0048_rotate_image/solution.rb
Set Matrix Zeroes	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0073_set_matrix_zeroes/solution.rb
Merge Intervals	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0056_merge_intervals/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#udemy-linked-list
Flatten Binary Tree to Linked List	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0114_flatten_binary_tree_to_linked_list/solution.rb
Swap Nodes in Pairs	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0024_swap_nodes_in_pairs/solution.rb
Merge Two Sorted Lists	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0021_merge_two_sorted_lists/solution.rb
Reverse Nodes in k-Group	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0025_reverse_nodes_in_k_group/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#udemy-tree-stack-queue
Binary Tree Inorder Traversal	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0094_binary_tree_inorder_traversal/solution.rb
Binary Tree Level Order Traversal	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0102_binary_tree_level_order_traversal/solution.rb
Maximum Depth of Binary Tree	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0104_maximum_depth_of_binary_tree/solution.rb
Binary Tree Maximum Path Sum	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0124_binary_tree_maximum_path_sum/solution.rb
Validate Binary Search Tree	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0098_validate_binary_search_tree/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#udemy-trie-and-heap
	https://github.com/pytdev/LeetCode-in-Ruby#udemy-graph
	https://github.com/pytdev/LeetCode-in-Ruby#udemy-dynamic-programming
Climbing Stairs	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0070_climbing_stairs/solution.rb
Minimum Path Sum	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0064_minimum_path_sum/solution.rb
Edit Distance	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0072_edit_distance/solution.rb
Regular Expression Matching	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0010_regular_expression_matching/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#udemy-backtrackingrecursion
Generate Parentheses	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0022_generate_parentheses/solution.rb
Combination Sum	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0039_combination_sum/solution.rb
Subsets	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0078_subsets/solution.rb
Letter Combinations of a Phone Number	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0017_letter_combinations_of_a_phone_number/solution.rb
Permutations	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0046_permutations/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#udemy-bit-manipulation
	https://github.com/pytdev/LeetCode-in-Ruby#udemy-design
	https://github.com/pytdev/LeetCode-in-Ruby#data-structure-i
	https://github.com/pytdev/LeetCode-in-Ruby#day-1-array
Maximum Subarray	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0053_maximum_subarray/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-2-array
Two Sum	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0001_two_sum/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-3-array
Best Time to Buy and Sell Stock	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0121_best_time_to_buy_and_sell_stock/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-4-array
	https://github.com/pytdev/LeetCode-in-Ruby#day-5-array
Search a 2D Matrix	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0074_search_a_2d_matrix/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-6-string
	https://github.com/pytdev/LeetCode-in-Ruby#day-7-linked-list
Merge Two Sorted Lists	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0021_merge_two_sorted_lists/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-8-linked-list
	https://github.com/pytdev/LeetCode-in-Ruby#day-9-stack-queue
Valid Parentheses	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0020_valid_parentheses/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-10-tree
Binary Tree Inorder Traversal	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0094_binary_tree_inorder_traversal/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-11-tree
Binary Tree Level Order Traversal	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0102_binary_tree_level_order_traversal/solution.rb
Maximum Depth of Binary Tree	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0104_maximum_depth_of_binary_tree/solution.rb
Symmetric Tree	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0101_symmetric_tree/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-12-tree
	https://github.com/pytdev/LeetCode-in-Ruby#day-13-tree
	https://github.com/pytdev/LeetCode-in-Ruby#day-14-tree
Validate Binary Search Tree	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0098_validate_binary_search_tree/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#data-structure-ii
	https://github.com/pytdev/LeetCode-in-Ruby#day-1-array-1
Single Number	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0136_single_number/solution.rb
3Sum	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0015_3sum/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-2-array-1
Sort Colors	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0075_sort_colors/solution.rb
Merge Intervals	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0056_merge_intervals/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-3-array-1
Rotate Image	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0048_rotate_image/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-4-array-1
	https://github.com/pytdev/LeetCode-in-Ruby#day-5-array-1
	https://github.com/pytdev/LeetCode-in-Ruby#day-6-string-1
	https://github.com/pytdev/LeetCode-in-Ruby#day-7-string
	https://github.com/pytdev/LeetCode-in-Ruby#day-8-string-1
Group Anagrams	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0049_group_anagrams/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-9-string-1
Longest Palindromic Substring	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0005_longest_palindromic_substring/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-10-linked-list
Add Two Numbers	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0002_add_two_numbers/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-11-linked-list
	https://github.com/pytdev/LeetCode-in-Ruby#day-12-linked-list
Swap Nodes in Pairs	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0024_swap_nodes_in_pairs/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-13-linked-list
Reverse Nodes in k-Group	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0025_reverse_nodes_in_k_group/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-14-stack-queue
	https://github.com/pytdev/LeetCode-in-Ruby#day-15-tree-1
Construct Binary Tree from Preorder and Inorder Traversal	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0105_construct_binary_tree_from_preorder_and_inorder_traversal/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-16-tree
	https://github.com/pytdev/LeetCode-in-Ruby#day-17-tree
	https://github.com/pytdev/LeetCode-in-Ruby#day-18-tree
	https://github.com/pytdev/LeetCode-in-Ruby#day-19-graph
	https://github.com/pytdev/LeetCode-in-Ruby#day-20-heap-priority-queue
	https://github.com/pytdev/LeetCode-in-Ruby#day-21-heap-priority-queue
	https://github.com/pytdev/LeetCode-in-Ruby#algorithm-i
	https://github.com/pytdev/LeetCode-in-Ruby#day-1-binary-search-1
Search Insert Position	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0035_search_insert_position/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-2-two-pointers
	https://github.com/pytdev/LeetCode-in-Ruby#day-3-two-pointers-1
	https://github.com/pytdev/LeetCode-in-Ruby#day-4-two-pointers-1
	https://github.com/pytdev/LeetCode-in-Ruby#day-5-two-pointers
Remove Nth Node From End of List	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0019_remove_nth_node_from_end_of_list/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-6-sliding-window
Longest Substring Without Repeating Characters	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0003_longest_substring_without_repeating_characters/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-7-breadth-first-search-depth-first-search-1
	https://github.com/pytdev/LeetCode-in-Ruby#day-8-breadth-first-search-depth-first-search-1
	https://github.com/pytdev/LeetCode-in-Ruby#day-9-breadth-first-search-depth-first-search
	https://github.com/pytdev/LeetCode-in-Ruby#day-10-recursion-backtracking-1
Merge Two Sorted Lists	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0021_merge_two_sorted_lists/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-11-recursion-backtracking-1
Permutations	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0046_permutations/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-12-dynamic-programming-2
Climbing Stairs	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0070_climbing_stairs/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#day-13-bit-manipulation
	https://github.com/pytdev/LeetCode-in-Ruby#day-14-bit-manipulation
Single Number	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0136_single_number/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#algorithms
Single Number	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0136_single_number/solution.rb
Palindrome Partitioning	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0131_palindrome_partitioning/solution.rb
Longest Consecutive Sequence	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0128_longest_consecutive_sequence/solution.rb
Binary Tree Maximum Path Sum	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0124_binary_tree_maximum_path_sum/solution.rb
Best Time to Buy and Sell Stock	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0121_best_time_to_buy_and_sell_stock/solution.rb
Flatten Binary Tree to Linked List	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0114_flatten_binary_tree_to_linked_list/solution.rb
Construct Binary Tree from Preorder and Inorder Traversal	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0105_construct_binary_tree_from_preorder_and_inorder_traversal/solution.rb
Maximum Depth of Binary Tree	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0104_maximum_depth_of_binary_tree/solution.rb
Binary Tree Level Order Traversal	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0102_binary_tree_level_order_traversal/solution.rb
Symmetric Tree	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0101_0200/s0101_symmetric_tree/solution.rb
Validate Binary Search Tree	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0098_validate_binary_search_tree/solution.rb
Unique Binary Search Trees	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0096_unique_binary_search_trees/solution.rb
Binary Tree Inorder Traversal	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0094_binary_tree_inorder_traversal/solution.rb
Largest Rectangle in Histogram	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0084_largest_rectangle_in_histogram/solution.rb
Word Search	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0079_word_search/solution.rb
Subsets	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0078_subsets/solution.rb
Minimum Window Substring	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0076_minimum_window_substring/solution.rb
Sort Colors	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0075_sort_colors/solution.rb
Search a 2D Matrix	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0074_search_a_2d_matrix/solution.rb
Set Matrix Zeroes	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0073_set_matrix_zeroes/solution.rb
Edit Distance	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0072_edit_distance/solution.rb
Climbing Stairs	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0070_climbing_stairs/solution.rb
Minimum Path Sum	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0064_minimum_path_sum/solution.rb
Unique Paths	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0062_unique_paths/solution.rb
Merge Intervals	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0056_merge_intervals/solution.rb
Jump Game	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0055_jump_game/solution.rb
Maximum Subarray	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0053_maximum_subarray/solution.rb
N-Queens	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0051_n_queens/solution.rb
Group Anagrams	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0049_group_anagrams/solution.rb
Rotate Image	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0048_rotate_image/solution.rb
Permutations	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0046_permutations/solution.rb
Jump Game II	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0045_jump_game_ii/solution.rb
Trapping Rain Water	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0042_trapping_rain_water/solution.rb
First Missing Positive	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0041_first_missing_positive/solution.rb
Combination Sum	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0039_combination_sum/solution.rb
Search Insert Position	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0035_search_insert_position/solution.rb
Find First and Last Position of Element in Sorted Array	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0034_find_first_and_last_position_of_element_in_sorted_array/solution.rb
Search in Rotated Sorted Array	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0033_search_in_rotated_sorted_array/solution.rb
Longest Valid Parentheses	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0032_longest_valid_parentheses/solution.rb
Next Permutation	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0031_next_permutation/solution.rb
Reverse Nodes in k-Group	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0025_reverse_nodes_in_k_group/solution.rb
Swap Nodes in Pairs	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0024_swap_nodes_in_pairs/solution.rb
Merge k Sorted Lists	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0023_merge_k_sorted_lists/solution.rb
Generate Parentheses	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0022_generate_parentheses/solution.rb
Merge Two Sorted Lists	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0021_merge_two_sorted_lists/solution.rb
Valid Parentheses	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0020_valid_parentheses/solution.rb
Remove Nth Node From End of List	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0019_remove_nth_node_from_end_of_list/solution.rb
Letter Combinations of a Phone Number	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0017_letter_combinations_of_a_phone_number/solution.rb
3Sum	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0015_3sum/solution.rb
Container With Most Water	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0011_container_with_most_water/solution.rb
Regular Expression Matching	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0010_regular_expression_matching/solution.rb
Palindrome Number	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0009_palindrome_number/solution.rb
String to Integer (atoi)	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0008_string_to_integer_atoi/solution.rb
Reverse Integer	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0007_reverse_integer/solution.rb
Zigzag Conversion	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0006_zigzag_conversion/solution.rb
Longest Palindromic Substring	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0005_longest_palindromic_substring/solution.rb
Median of Two Sorted Arrays	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0004_median_of_two_sorted_arrays/solution.rb
Longest Substring Without Repeating Characters	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0003_longest_substring_without_repeating_characters/solution.rb
Add Two Numbers	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0002_add_two_numbers/solution.rb
Two Sum	https://github.com/pytdev/LeetCode-in-Ruby/blob/main/src/main/ruby/g0001_0100/s0001_two_sum/solution.rb
	https://github.com/pytdev/LeetCode-in-Ruby#contributing
leetcode-in-ruby.github.io	https://leetcode-in-ruby.github.io
Readme	https://github.com/pytdev/LeetCode-in-Ruby#readme-ov-file
MIT license	https://github.com/pytdev/LeetCode-in-Ruby#MIT-1-ov-file
Please reload this page	https://github.com/pytdev/LeetCode-in-Ruby
Activity	https://github.com/pytdev/LeetCode-in-Ruby/activity
Custom properties	https://github.com/pytdev/LeetCode-in-Ruby/custom-properties
0 forks	https://github.com/pytdev/LeetCode-in-Ruby/forks
Report repository	https://github.com/contact/report-content?content_url=https%3A%2F%2Fgithub.com%2Fpytdev%2FLeetCode-in-Ruby&report=pytdev+%28user%29
Releases	https://github.com/pytdev/LeetCode-in-Ruby/releases
Packages 0	https://github.com/orgs/pytdev/packages?repo_name=LeetCode-in-Ruby
Please reload this page	https://github.com/pytdev/LeetCode-in-Ruby
Contributors	https://github.com/pytdev/LeetCode-in-Ruby/graphs/contributors
Please reload this page	https://github.com/pytdev/LeetCode-in-Ruby
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