| 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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KnightJoker
KnightJoker