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All Projects → KnightJoker → Leetcode Solutions

KnightJoker / Leetcode Solutions

LeetCode Solutions in Objective - C or Swift. At least one question every day

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swift
15916 projects
objc
23 projects

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# Title Solution Difficulty
344 Reverse String Objective-C、Swift Easy
541 Reverse String II Swift Easy
345 Reverse Vowels of a String Swift Easy
258 Add Digits Objective-C、Swift Easy
389 Find the Difference Objective-C、Swift Easy
226 Invert Binary Tree Objective-C、Swift Easy
283 Move Zeroes Objective-C、Swift Easy
404 Sum of Left Leaves Objective-C、Swift Easy
409 Longest Palindrome Objective-C、Swift Easy
383 Ransom Note Objective-C、Swift Easy
237 Delete Node in a Linked List Objective-C Easy
349 Intersection of Two Arrays Objective-C、Swift Easy
100 Same Tree Objective-C、Swift Easy
171 Excel Sheet Column Number Objective-C、Swift Easy
242 Valid Anagram Objective-C、Swift Easy
169 Majority Element Objective-C、Swift Easy
387 First Unique Character in a String Objective-C、Swift Easy
217 Contains Duplicate Objective-C、Swift Easy
219 Contains Duplicate II Swift Easy
350 Intersection of Two Arrays II Objective-C、Swift Easy
13 Roman to Integer Objective-C、Swift Easy
412 Fizz Buzz Objective-C、Swift Easy
206 Reverse Linked List Objective-C、Swift Easy
415 Add Strings Objective-C、Swift Easy
405 Convert a Number to Hexadecimal Objective-C、Swift Easy
231 Power of Two Objective-C、Swift Easy
326 Power of Three Objective-C、Swift Easy
202 Happy Number Objective-C、Swift Easy
121 Best Time to Buy and Sell Stock Objective-C、Swift Easy
83 Remove Duplicates from Sorted List Objective-C、Swift Easy
70 Climbing Stairs Objective-C、Swift Easy
104 Maximum Depth of Binary Tree Objective-C、Swift Easy
461 Hamming Distance Objective-C、Swift Easy
476 Number Complement Objective-C、Swift Easy
496 Next Greater Element I Objective-C、Swift Easy
520 Detect Capital Objective-C、Swift Easy
371 Sum of Two Integers Objective-C、Swift Easy
657 Judge Route Circle Swift Easy
617 Merge Two Binary Trees Swift Easy
561 Array Partition I Swift Easy
500 Keyboard Row Swift Easy
557 Reverse Words in a String III Swift Easy
575 Distribute Candies Swift Easy
566 Reshape the Matrix Swift Easy
463 Island Perimeter Swift Easy
637 Average of Levels in Binary Tree Swift Easy
521 Longest Uncommon Subsequence I Swift Easy
485 Max Consecutive Ones Swift Easy
448 Find All Numbers Disappeared in an Array Swift Easy
653 Two Sum IV - Input is a BST Swift Easy
606 Construct String from Binary Tree Swift Easy
538 Convert BST to Greater Tree Swift Easy
492 Construct the Rectangle Swift Easy
598 Range Addition II Swift Easy
453 Minimum Moves to Equal Array Elements Swift Easy
530 Minimum Absolute Difference in BST Swift Easy
455 Assign Cookies Swift Easy
122 Best Time to Buy and Sell Stock II Swift Easy
167 Two Sum II - Input array is sorted Swift Easy
563 Binary Tree Tilt Swift Easy
599 Minimum Index Sum of Two Lists Swift Easy
661 Image Smoother Swift Easy
506 Relative Ranks Swift Easy
628 Maximum Product of Three Numbers Swift Easy
447 Number of Boomerangs Swift Easy
401 Binary Watch Swift Easy
504 Base 7 Swift Easy
268 Missing Number Swift Easy
674 Longest Continuous Increasing Subsequence Swift Easy
543 Diameter of Binary Tree Swift Easy
551 Student Attendance Record I Swift Easy
671 Second Minimum Node In a Binary Tree Swift Easy
108 Convert Sorted Array to Binary Search Tree Swift Easy
594 Longest Harmonious Subsequence Swift Easy
572 Subtree of Another Tree Swift Easy
107 Binary Tree Level Order Traversal II Swift Easy
645 Set Mismatch Swift Easy
437 Path Sum III Swift Easy
53 Maximum Subarray Swift Easy
35 Search Insert Position Swift Easy
27 Remove Element Swift Easy
263 Ugly Number Swift Easy
21 Merge Two Sorted Lists Swift Easy
198 House Robber Swift Easy
257 Binary Tree Paths Swift Easy
1 Two Sum Swift Easy
118 Pascal's Triangle Swift Easy
119 Pascal's Triangle II Swift Easy
342 Power of Four Swift Easy
101 Symmetric Tree Swift Easy
367 Valid Perfect Square Swift Easy
66 Plus One Swift Easy
459 Repeated Substring Pattern Swift Easy
9 Palindrome Number Swift Easy
110 Balanced Binary Tree Swift Easy
26 Remove Duplicates from Sorted Array Swift Easy
643 Maximum Average Subarray I Swift Easy
441 Arranging Coins Swift Easy
501 Find Mode in Binary Search Tree Swift Easy
434 Number of Segments in a String Swift Easy
172 Factorial Trailing Zeroes Swift Easy
38 Count and Say Swift Easy
112 Path Sum Swift Easy
507 Perfect Number Swift Easy
205 Isomorphic Strings Swift Easy
438 Find All Anagrams in a String Swift Easy
20 Vaild Parentheses Swift Easy
290 Word Pattern Swift Easy
720 Longest Word in Dictionary Swift Easy
724 Find Pivot Index Swift Easy
680 Valid Palindrome II Swift Easy
58 Length of Last Word Swift Easy
88 Merge Sorted Array Swift Easy
203 Remove Linked List Elements Swift Easy
633 Sum of Square Numbers Swift Easy
686 Repeated String Match Swift Easy
111 Minimum Depth of Binary Tree Swift Easy
234 Palindrome Linked List Swift Easy
687 Longest Univalue Path Swift Easy
7 Reverse Integer Swift Easy
14 Longest Common Prefix Swift Easy
414 Third Maximum Number Swift Easy
605 Can Place Flowers Swift Easy
400 Nth Digit Swift Easy
443 String Compression Swift Easy
475 Heaters Swift Easy
69 Sqrt(x) Swift Easy
204 Count Primes Swift Easy
28 Implement strStr() Swift Easy
168 Excel Sheet Column Title Swift Easy
581 Shortest Unsorted Continuous Subarray Swift Easy
125 Valid Palindrome Swift Easy
788 Rotated Digits Swift Easy
189 Rotate Array Swift Easy
665 Non-decreasing Array Swift Easy
669 Trim a Binary Search Tree Swift Easy
532 K-diff Pairs in an Array Swift Easy
693 Binary Number with Alternating Bits Swift Easy
695 Max Area of Island Swift Easy
696 Count Binary Substrings Swift Easy
697 Degree of an Array Swift Easy
717 1-bit and 2-bit Characters Swift Easy
733 Flood Fill Swift Easy
748 Largest Number At Least Twice of Others Swift Easy
682 Baseball Game Swift Easy
479 Largest Palindrome Product Swift Easy
744 Find Smallest Letter Greater Than Target Swift Easy
747 Min Cost Climbing Stairs Swift Easy
760 Find Anagram Mappings Swift Easy
762 Prime Number of Set Bits in Binary Representation Swift Easy
482 License Key Formatting Swift Easy
771 Jewels and Stones Swift Easy
766 Toeplitz Matrix Swift Easy
442 Find All Duplicates in an Array Swift Medium
540 Single Element in a Sorted Array Swift Medium
654 Maximum Binary Tree Swift Medium
515 Find Largest Value in Each Tree Row Swift Medium
260 Single Number III Swift Medium
513 Find Bottom Left Tree Value Swift Medium
728 Self Dividing Numbers Swift Medium
537 Complex Number Multiplication Swift Medium
406 Queue Reconstruction by Height Swift Medium
419 Battleships in a Board Swift Medium
647 Palindromic Substrings Swift Medium
553 Optimal Division Swift Medium
413 Arithmetic Slices Swift Medium
739 Daily Temperatures Swift Medium
508 Most Frequent Subtree Sum Swift Medium
462 Minimum Moves to Equal Array Elements II Swift Medium
667 Beautiful Arrangement II Swift Medium
495 Teemo Attacking Swift Medium
451 Sort Characters By Frequency Swift Medium
655 Print Binary Tree Swift Medium
238 Product of Array Except Self Swift Medium
712 Minimum ASCII Delete Sum for Two Strings Swift Medium
725 Split Linked List in Parts Swift Medium
565 Array Nesting Swift Medium
347 Top K Frequent Elements Swift Medium
672 Bulb Switcher II Swift Medium
94 Binary Tree Inorder Traversal Swift Medium
477 Total Hamming Distance Swift Medium
503 Next Greater Element II Swift Medium
646 Maximum Length of Pair Chain Swift Medium
526 Beautiful Arrangement Swift Medium
454 4Sum II Swift Medium
421 Maximum XOR of Two Numbers in an Array Swift Medium
648 Replace Words Swift Medium
22 Generate Parentheses Swift Medium
39 Combination Sum Swift Medium
216 Combination Sum III Swift Medium
623 Add One Row to Tree Swift Medium
343 Integer Break Swift Medium
144 Binary Tree Preorder Traversal Swift Medium
498 Diagonal Traverse Swift Medium
2 Add Two Numbers Swift Medium
445 Add Two Numbers II Swift Medium
592 Fraction Addition and Subtraction Swift Medium
539 Minimum Time Difference Swift Medium
12 Integer to Roman Swift Medium
241 Different Ways to Add Parentheses Swift Medium
378 Kth Smallest Element in a Sorted Matrix Swift Medium
318 Maximum Product of Word Lengths Swift Medium
230 Kth Smallest Element in a BST Swift Medium
650 2 Keys Keyboard Swift Medium
392 Is Subsequence Swift Medium
423 Reconstruct Original Digits from English Swift Medium
583 Delete Operation for Two Strings Swift Medium
337 House Robber III Swift Medium
287 Find the Duplicate Number Swift Medium
78 Subsets Swift Medium
740 Delete and Earn Swift Medium
791 Custom Sort String Swift Medium
547 Friend Circles Swift Medium
763 Partition Labels Swift Medium
494 Target Sum Swift Medium
524 Longest Word in Dictionary through Deleting Swift Medium
46 Permutations Swift Medium
229 Majority Element II Swift Medium
319 Bulb Switcher Swift Medium
424 Longest Repeating Character Replacement Swift Medium
377 Combination Sum IV Swift Medium
137 Single Number II Swift Medium
516 Longest Palindromic Subsequence Swift Medium
89 Gray Code Swift Medium
328 Odd Even Linked List Swift Medium
102 Binary Tree Level Order Traversal Swift Medium
394 Decode String Swift Medium
48 Rotate Image Swift Medium
199 Binary Tree Right Side View Swift Medium
390 Elimination Game Swift Medium
636 Exclusive Time of Functions Swift Medium
684 Redundant Connection Swift Medium
96 Unique Binary Search Trees Swift Medium
62 Unique Paths Swift Medium
807 Max Increase to Keep City Skyline Swift Medium
309 Best Time to Buy and Sell Stock with Cooldown Swift Medium
692 Top K Frequent Words Swift Medium
525 Contiguous Array Swift Medium
77 Combinations Swift Medium
435 Non-overlapping Intervals Swift Medium
59 Spiral Matrix II Swift Medium
64 Minimum Path Sum Swift Medium
153 Find Minimum in Rotated Sorted Array Swift Medium
738 Monotone Increasing Digits Swift Medium
3 Longest Substring Without Repeating Characters Swift Medium
5 Longest Palindromic Substring Swift Medium
6 ZigZag Conversion Swift Medium
535 Encode and Decode TinyURL Objective-C Medium
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