LeetCode Swift Solutions

My goal is to provide access to my solutions and to have most of them in the perfect: Runtime: 0 ms, faster than 100.00% of Swift online submissions for Valid Parentheses.

#1 Two Sum
#2 Add Two Number
#3 Longest Substring Without Repeating Characters
#8 String to Integer (atoi)
#12 Integer to Roman
#13 Roman to Integer
#15 Three Sum
#20 Valid Parentheses
#21 Merge Two Sorted Lists
#23 Merge k Sorted Lists
#24 Swap Nodes in Pairs
#42 Trapping Rain Water
#48 Rotate Image
#49 Group Anagrams
#53 Maximum Subarray
#58 Length of Last Word
#70 Climbing Stairs
#78 Subsets
#88 Merge Sorted Array
#94 Binary Tree Inorder Traversal
#98 Validate Binary Search Tree
#101 Symmetric Tree
#102 Binary Tree Level Order Traversal
#103 Binary Tree Zigzag Level Order Traversal
#104 Maximum Depth of Binary Tree
#121 Best Time to Buy and Sell Stock
#124 Binary Tree Maximum Path Sum
#127 Word Ladder
#138 Copy List with Random Pointer
#139 Word Break
#144 Binary Tree Preorder Traversal
#145 Binary Tree Postorder Traversal
#146 LRU Cache
#155 Min Stack
#160 Intersection of Two Linked Lists
#167 Two Sum II - Input array is sorted
#173 Binary Search Tree Iterator
#189 Rotate Array
#199 Binary Tree Right Side View
#200 Number of Islands
#203 Remove Linked List Elements
#206 Reverse Linked List
#207 Course Schedule
#208 Implement Trie (Prefix Tree)
#210 Course Schedule II
#226 Invert Binary Tree
#230 Kth Smallest Element in a BST
#231 Power of Two
#232 Implement Queue using Stacks
#234 Palindrome Linked List
#236 Lowest Common Ancestor of a Binary Tree
#237 Delete Node in a Linked List
#240 Search a 2D Matrix II
#252 Meeting Rooms
#253 Meeting Rooms II
#270 Closest Binary Search Tree Value
#286 Walls and Gates
#293 Flip Game
#297 Serialize and Deserialize Binary Tree
#328 Odd Even Linked List
#332 Reconstruct Itinerary
#334 Reverse String
#347 Top K Frequent Elements
#348 Design Tic-Tac-Toe
#349 Intersection of Two Arrays
#367 Valid Perfect Square
#380 Insert Delete GetRandom O(1)
#392 Is Subsequence
#402 Remove K Digits
#403 Frog Jump
#412 Fizz Buzz
#438 Find All Anagrams in a String
#443 String Compression
#448 Find All Numbers Disappeared in an Array
#451 Sort Characters By Frequencey
#509 Fibonacci Number
#540 Single Element in a Sorted Array
#547 Friend Circles
#567 Permutation in String
#572 Subtree of Another Tree
#637 Average of Levels in Binary Tree
#653 Two Sum IV - Input is a BST
#657 Robot Return to Origin
#692 Top K Frequent Words
#695 Max Area of Island
#700 Search in a Binary Search Tree
#706 Design HashMap
#773 Flood Fill
#811 Subdomain Visit Count
#819 Most Common Word
#844 BAckspace String Compare
#918 Maximum Sum Circular Subarray
#937 Reorder Data in Log Files
#957 Prison Cells After N Days
#966 Vowel Spellchecker
#973 K Closest Points to Origin
#993 Cousins in Binary Tree
#994 Rotting Oranges
#997 Find the Town Judge
#1008 Construct Binary Search Tree from Preorder Traversal
#1167 Minimum Cost to Connect Sticks
#1232 Check If Is Is a Straight Line
#1268 Search Suggestions System
#1277 Count Square Submatrices with All Ones
#1347 Minimum Number of Steps to Make Two Strings Anagram
#1431 Kids With the Greatest Number of Candies
#1441 Build an Array With Stack Operations

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I'm solely providing my solutions as well as questions and examples for context.

davidseek/leetcode-swift

LeetCode Swift Solutions