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leetcode-swift

★ 31 Open GitHub ↗

Here you can find my Swift submissions for the leetcode challenges

// repository documentation

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# 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](https://leetcode.com/problems/two-sum/)
* [#2 Add Two Number](https://leetcode.com/problems/add-two-numbers/) 
* [#3 Longest Substring Without Repeating Characters](https://leetcode.com/problems/longest-substring-without-repeating-characters/)
* [#8 String to Integer (atoi)](https://leetcode.com/problems/string-to-integer-atoi/)
* [#12 Integer to Roman](https://leetcode.com/problems/integer-to-roman/) 
* [#13 Roman to Integer](https://leetcode.com/problems/roman-to-integer/) 
* [#15 Three Sum](https://leetcode.com/problems/3sum/)
* [#20 Valid Parentheses](https://leetcode.com/problems/valid-parentheses/)
* [#21 Merge Two Sorted Lists](https://leetcode.com/problemset/all/) 
* [#23 Merge k Sorted Lists](https://leetcode.com/problems/merge-k-sorted-lists/)
* [#24 Swap Nodes in Pairs](https://leetcode.com/problems/swap-nodes-in-pairs/)
* [#42 Trapping Rain Water](https://leetcode.com/problems/trapping-rain-water/)
* [#48 Rotate Image](https://leetcode.com/problems/rotate-image/)
* [#49 Group Anagrams](https://leetcode.com/problems/group-anagrams/)
* [#53 Maximum Subarray](https://leetcode.com/problems/maximum-subarray/)
* [#58 Length of Last Word](https://leetcode.com/problems/length-of-last-word/)
* [#70 Climbing Stairs](https://leetcode.com/problems/climbing-stairs/)
* [#78 Subsets](https://leetcode.com/problems/subsets/)
* [#88 Merge Sorted Array](https://leetcode.com/problems/merge-sorted-array/)
* [#94 Binary Tree Inorder Traversal](https://leetcode.com/problems/binary-tree-inorder-traversal/)
* [#98 Validate Binary Search Tree](https://leetcode.com/problems/validate-binary-search-tree/)
* [#101 Symmetric Tree](https://leetcode.com/problems/symmetric-tree/)
* [#102 Binary Tree Level Order Traversal](https://leetcode.com/problems/binary-tree-level-order-traversal/)
* [#103 Binary Tree Zigzag Level Order Traversal](https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal/)
* [#104 Maximum Depth of Binary Tree](https://leetcode.com/problems/maximum-depth-of-binary-tree/)
* [#121 Best Time to Buy and Sell Stock](https://leetcode.com/problems/best-time-to-buy-and-sell-stock/)
* [#124 Binary Tree Maximum Path Sum](https://leetcode.com/problems/binary-tree-maximum-path-sum/)
* [#127 Word Ladder](https://leetcode.com/problems/word-ladder/)
* [#138 Copy List with Random Pointer](https://leetcode.com/problems/copy-list-with-random-pointer/)
* [#139 Word Break](https://leetcode.com/problems/word-break/)
* [#144 Binary Tree Preorder Traversal](https://leetcode.com/problems/binary-tree-preorder-traversal/)
* [#145 Binary Tree Postorder Traversal](https://leetcode.com/problems/binary-tree-postorder-traversal/)
* [#146 LRU Cache](https://leetcode.com/problems/lru-cache/)
* [#155 Min Stack](https://leetcode.com/problems/min-stack/)
* [#160 Intersection of Two Linked Lists](https://leetcode.com/problems/intersection-of-two-linked-lists/)
* [#167 Two Sum II - Input array is sorted](https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/)
* [#173 Binary Search Tree Iterator](https://leetcode.com/problems/binary-search-tree-iterator/)
* [#189 Rotate Array](https://leetcode.com/problems/rotate-array/)
* [#199 Binary Tree Right Side View](https://leetcode.com/problems/binary-tree-right-side-view/)
* [#200 Number of Islands](https://leetcode.com/problems/number-of-islands/)
* [#203 Remove Linked List Elements](https://leetcode.com/problems/remove-linked-list-elements/)
* [#206 Reverse Linked List](https://leetcode.com/problems/reverse-linked-list/)
* [#207 Course Schedule](https://leetcode.com/problems/course-schedule/)
* [#208 Implement Trie (Prefix Tree)](https://leetcode.com/problems/implement-trie-prefix-tree/)
* [#210 Course Schedule II](https://leetcode.com/problems/course-schedule-ii/)
* [#226 Invert Binary Tree](https://leetcode.com/problems/invert-binary-tree/)
* [#230 Kth Smallest Element in a BST](https://leetcode.com/problems/kth-smallest-element-in-a-bst/)
* [#231 Power of Two](https://leetcode.com/problems/power-of-two/)
* [#232 Implement Queue using Stacks](https://leetcode.com/problems/implement-queue-using-stacks/)
* [#234 Palindrome Linked List](https://leetcode.com/problems/palindrome-linked-list/)
* [#236 Lowest Common Ancestor of a Binary Tree](https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree/)
* [#237 Delete Node in a Linked List](https://leetcode.com/problems/delete-node-in-a-linked-list/)
* [#240 Search a 2D Matrix II](https://leetcode.com/problems/search-a-2d-matrix-ii/)
* [#252 Meeting Rooms](https://leetcode.com/problems/meeting-rooms/)
* [#253 Meeting Rooms II](https://leetcode.com/problems/meeting-rooms-ii/)
* [#270 Closest Binary Search Tree Value](https://leetcode.com/problems/closest-binary-search-tree-value/)
* [#286 Walls and Gates](https://leetcode.com/problems/walls-and-gates/)
* [#293 Flip Game](https://leetcode.com/problems/flip-game/)
* [#297 Serialize and Deserialize Binary Tree](https://leetcode.com/problems/serialize-and-deserialize-binary-tree/)
* [#328 Odd Even Linked List](https://leetcode.com/problems/odd-even-linked-list/)
* [#332 Reconstruct Itinerary](https://leetcode.com/problems/reconstruct-itinerary/)
* [#334 Reverse String](https://leetcode.com/problems/reverse-string/)
* [#347 Top K Frequent Elements](https://leetcode.com/problems/top-k-frequent-elements/)
* [#348 Design Tic-Tac-Toe](https://leetcode.com/problems/design-tic-tac-toe/)
* [#349 Intersection of Two Arrays](https://leetcode.com/problems/intersection-of-two-arrays/)
* [#367 Valid Perfect Square](https://leetcode.com/problems/valid-perfect-square/)
* [#380 Insert Delete GetRandom O(1)](https://leetcode.com/problems/insert-delete-getrandom-o1/)
* [#392 Is Subsequence](https://leetcode.com/problems/is-subsequence/)
* [#402 Remove K Digits](https://leetcode.com/problems/remove-k-digits/)
* [#403 Frog Jump](https://leetcode.com/problems/frog-jump/)
* [#412 Fizz Buzz](https://leetcode.com/problems/fizz-buzz/)
* [#438 Find All Anagrams in a String](https://leetcode.com/problems/find-all-anagrams-in-a-string/)
* [#443 String Compression](https://leetcode.com/problems/string-compression/)
* [#448 Find All Numbers Disappeared in an Array](https://leetcode.com/problems/find-all-numbers-disappeared-in-an-array/)
* [#451 Sort Characters By Frequencey](https://leetcode.com/problems/sort-characters-by-frequency/)
* [#509 Fibonacci Number](https://leetcode.com/problems/fibonacci-number/)
* [#540 Single Element in a Sorted Array](https://leetcode.com/problems/single-element-in-a-sorted-array/)
* [#547 Friend Circles](https://leetcode.com/problems/friend-circles/)
* [#567 Permutation in String](https://leetcode.com/problems/permutation-in-string/)
* [#572 Subtree of Another Tree](https://leetcode.com/problems/subtree-of-another-tree/)
* [#637 Average of Levels in Binary Tree](https://leetcode.com/problems/average-of-levels-in-binary-tree/)
* [#653 Two Sum IV - Input is a BST](https://leetcode.com/problems/two-sum-iv-input-is-a-bst/)
* [#657 Robot Return to Origin](https://leetcode.com/problems/robot-return-to-origin/)
* [#692 Top K Frequent Words](https://leetcode.com/problems/top-k-frequent-words/)
* [#695 Max Area of Island](https://leetcode.com/problems/max-area-of-island/)
* [#700 Search in a Binary Search Tree](https://leetcode.com/problems/search-in-a-binary-search-tree/)
* [#706 Design HashMap](https://leetcode.com/problems/design-hashmap/) 
* [#773 Flood Fill](https://leetcode.com/problems/flood-fill/)
* [#811 Subdomain Visit Count](https://leetcode.com/problems/subdomain-visit-count/)
* [#819 Most Common Word](https://leetcode.com/problems/most-common-word/)
* [#844 BAckspace String Compare](https://leetcode.com/problems/backspace-string-compare/)
* [#918 Maximum Sum Circular Subarray](https://leetcode.com/problems/maximum-sum-circular-subarray/)
* [#937 Reorder Data in Log Files](https://leetcode.com/problems/reorder-data-in-log-files/)
* [#957 Prison Cells After N Days](https://leetcode.com/problems/prison-cells-after-n-days/)
* [#966 Vowel Spellchecker](https://leetcode.com/problems/vowel-spellchecker/)
* [#973 K Closest Points to Origin](https://leetcode.com/problems/k-closest-points-to-origin/)
* [#993 Cousins in Binary Tree](https://leetcode.com/problems/cousins-in-binary-tree/)
* [#994 Rotting Oranges](https://leetcode.com/problems/rotting-oranges/)
* [#997 Find the Town Judge](https://leetcode.com/problems/find-the-town-judge/)
* [#1008 Construct Binary Search Tree from Preorder Traversal](https://leetcode.com/problems/construct-binary-search-tree-from-preorder-traversal/)
* [#1167 Minimum Cost to Connect Sticks](https://leetcode.com/problems/minimum-cost-to-connect-sticks/)
* [#1232 Check If Is Is a Straight Line](https://leetcode.com/problems/check-if-it-is-a-straight-line/)
* [#1268 Search Suggestions System](https://leetcode.com/problems/search-suggestions-system/)
* [#1277 Count Square Submatrices with All Ones](https://leetcode.com/problems/count-square-submatrices-with-all-ones/)
* [#1347 Minimum Number of Steps to Make Two Strings Anagram](https://leetcode.com/problems/minimum-number-of-steps-to-make-two-strings-anagram/)
* [#1431 Kids With the Greatest Number of Candies](https://leetcode.com/problems/kids-with-the-greatest-number-of-candies/)
* [#1441 Build an Array With Stack Operations](https://leetcode.com/contest/weekly-contest-188/problems/build-an-array-with-stack-operations/)

All challenges are copyright by https://leetcode.com/ and their respective authors.

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

leetcode-swift

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