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| 1 |
Two Sum |
Solution ⭐ |
O(n) |
O(n) |
Easy |
Array, Hash Table |
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| 2 |
Add Two Numbers |
Solution |
O(n) |
O(1) |
Medium |
Linked List, Math |
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| 3 |
Longest Substring Without Repeating Characters |
Solution ⭐ |
O(n) |
O(n) |
Medium |
Hash Table, Two Pointers, String |
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| 7 |
Reverse Integer |
Solution ⭐ |
O(n) |
O(1) |
Easy |
Math |
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| 9 |
Palindrome Number |
Solution |
O(1) |
O(1) |
Easy |
Math |
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| 11 |
Container With Most Water |
Solution ⭐ |
O(n) |
O(1) |
Medium |
Array, Two Pointers |
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| 12 |
Integer to Roman |
Solution ⭐ |
O(1) |
O(1) |
Medium |
Math, String |
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| 13 |
Roman to Integer |
Solution ⭐ |
O(n) |
O(1) |
Medium |
Math, String |
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| 14 |
Longest Common Prefix |
Solution |
O(n^2) |
O(1) |
Easy |
String |
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| 19 |
Remove Nth Node From End of List |
Solution |
O(n) |
O(1) |
Medium |
Linked List, Two Pointers |
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| 20 |
Valid Parentheses |
Solution |
O(n) |
O(n) |
Easy |
String, Stack |
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| 21 |
Merge Two Sorted Lists |
Solution |
O(n) |
O(n) |
Easy |
Linked List |
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| 24 |
Swap Nodes in Pairs |
Solution |
O(n) |
O(1) |
Medium |
Linked List |
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| 25 |
Reverse Nodes in k-Group |
Solution |
O(n) |
O(1) |
Hard |
Linked List |
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| 26 |
Remove Duplicates from Sorted Array |
Solution |
O(n) |
O(1) |
Easy |
Array, Two Pointers |
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| 27 |
Remove Element |
Solution |
O(n) |
O(1) |
Easy |
Array, Two Pointers |
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| 35 |
Search Insert Position |
Solution |
O(n) |
O(1) |
Easy |
Array, Binary Search |
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| 43 |
Multiply Strings |
Solution |
O(1) |
O(1) |
Medium |
Math, String |
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| 50 |
Pow(x,n) |
Solution |
O(logn) |
O(1) |
Medium |
Math, Binary Search |
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| 53 |
Maximum Subarray |
Solution |
O(n) |
O(1) |
Easy |
Array, Divide and Conquer, Dynamic Programming |
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| 61 |
Plus One |
Solution |
O(n) |
O(1) |
Easy |
Array, Math |
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| 65 |
Valid Number |
Solution |
O(1) |
O(1) |
Hard |
Math, String |
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| 73 |
Set Matrix Zeroes |
Solution |
O(n^2) |
O(1) |
Medium |
Array |
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| 78 |
Subsets |
Solution |
O(n^2) |
O(n^2) |
Medium |
Array, Backtracking, Bit Manipulation |
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| 83 |
Remove Duplicates from Sorted List |
Solution |
O(n) |
O(1) |
Easy |
Linked List |
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| 89 |
Gray Code |
Solution |
O(n^2) |
O(n) |
Medium |
Backtracking |
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| 118 |
Pascal's Triangle |
Solution |
O(n^2) |
O(1) |
Easy |
Array |
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| 119 |
Pascal's Triangle II |
Solution |
O(n^2) |
O(k) |
Easy |
Array |
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| 121 |
Best Time to Buy and Sell Stock |
Solution |
O(n) |
O(1) |
Easy |
Array, Dynamic Programming |
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| 125 |
Valid Palindrome |
Solution |
O(1) |
O(1) |
Easy |
Two Pointers, String |
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| 136 |
Single Number |
Solution |
O(n) |
O(1) |
Easy |
Hash Table, Bit Manipulation |
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| 141 |
Linked List Cycle |
Solution |
O(n) |
O(1) |
Easy |
Linked List, Two Pointers |
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| 142 |
Linked List Cycle II |
Solution |
O(n) |
O(n) |
Medium |
Linked List, Two Pointers |
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| 160 |
Intersection of Two Linked Lists |
Solution |
O(n) |
O(n) |
Easy |
Linked List |
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| 167 |
Two Sum II - Input array is sorted |
Solution |
O(n) |
O(1) |
Easy |
Array, Two Pointers, Binary Search |
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| 169 |
Majority Element |
Solution |
O(n) |
O(1) |
Easy |
Array, Divide and Conquer, Bit Manipulation |
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| 172 |
Factorial Trailing Zeroes |
Solution |
O(n) |
O(1) |
Easy |
Math |
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| 189 |
Rotate Array |
Solution |
O(1) |
O(1) |
Easy |
Array |
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| 203 |
Remove Linked List Elements |
Solution |
O(n) |
O(1) |
Easy |
Linked List |
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| 204 |
Count Primes |
Solution |
O(n) |
O(n) |
Easy |
Hash Table, Math |
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| 206 |
Reverse Linked List |
Solution |
O(n) |
O(n) |
Easy |
Linked List |
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| 217 |
Contains Duplicate |
Solution |
O(n) |
O(n) |
Easy |
Array, Hash Table |
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| 219 |
Contains Duplicate II |
Solution |
O(n) |
O(n) |
Easy |
Array, Hash Table |
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| 231 |
Power of Two |
Solution |
O(1) |
O(1) |
Easy |
Math, Bit Manipulation |
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| 234 |
Palindrome Linked List |
Solution |
O(n) |
O(n) |
Easy |
Linked List, Two Pointers |
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| 237 |
Delete Node in a Linked List |
Solution |
O(1) |
O(1) |
Easy |
Linked List |
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| 242 |
Valid Anagram |
Solution |
O(n) |
O(n) |
Easy |
Hash Table, Sort |
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| 268 |
Missing Number |
Solution |
O(n) |
O(1) |
Easy |
Array, Math, Bit Manipulation |
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| 283 |
Move Zeroes |
Solution |
O(n) |
O(1) |
Easy |
Array, Two Pointers |
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| 287 |
Find the Duplicate Number |
Solution |
O(nlogn) |
O(1) |
Easy |
Array, Two Pointers, Binary Search |
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| 326 |
Power of Three |
Solution |
O(logn) |
O(1) |
Easy |
Math |
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| 328 |
Odd Even Linked List |
Solution |
O(n) |
O(1) |
Medium |
Linked List |
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| 344 |
Reverse String |
Solution |
O(1) |
O(1) |
Easy |
String, Two Pointer |
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| 345 |
Reverse Vowels of a String |
Solution |
O(n) |
O(1) |
Easy |
Two Pointers, String |
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| 367 |
Valid Perfect Square |
Solution |
O(n) |
O(1) |
Easy |
Math, Binary Search |
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| 389 |
Find the Difference |
Solution |
O(n) |
O(1) |
Easy |
Hash Table, Bit Manipulation |
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| 441 |
Arranging Coins |
Solution |
O(1) |
O(1) |
Easy |
Math, Binary Search |
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| 445 |
Add Two Numbers II |
Solution |
O(n) |
O(n) |
Medium |
Linked List |
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| 448 |
Find All Numbers Disappeared in an Array |
Solution |
O(n) |
O(n) |
Easy |
Array |
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| 461 |
Hamming Distance |
Solution |
O(n) |
O(1) |
Easy |
Bit Manipulation |
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| 476 |
Number Complement |
Solution |
O(n) |
O(n) |
Easy |
Bit Manipulation |
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| 485 |
Max Consecutive Ones |
Solution |
O(n) |
O(1) |
Easy |
Array |
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| 507 |
Perfect Number |
Solution |
O(logn) |
O(1) |
Easy |
Math |
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| 535 |
Encode and Decode TinyURL |
Solution |
O(1) |
O(1) |
Medium |
Hash Table, Math |
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| 557 |
Reverse Words in a String |
Solution |
O(n) |
O(1) |
Easy |
String |
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| 561 |
Array Partition I |
Solution |
O(n) |
O(1) |
Easy |
Array |
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| 566 |
Reshape the Matrix |
Solution |
O(n) |
O(n^2) |
Easy |
Array |
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| 599 |
Minimum Index Sum of Two Lists |
Solution |
O(n) |
O(n) |
Easy |
Hash Table |
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| 628 |
Maximum Product of Three Numbers |
Solution |
O(nlogn) |
O(1) |
Easy |
Array, Math |
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| 633 |
Sum of Square Numbers |
Solution |
O(logn) |
O(1) |
Easy |
Math |
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| 645 |
Set Mismatch |
Solution |
O(1) |
O(n) |
Easy |
Hash Table, Math |
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| 693 |
Binary Number with Alternating Bits |
Solution |
O(n) |
O(1) |
Easy |
Bit Manipulation |
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| 697 |
Degree of an Array |
Solution |
O(n) |
O(n) |
Easy |
Array |
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| 804 |
Unique Morse Code Words |
Solution |
O(n^2) |
O(n) |
Easy |
String |
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| 832 |
Flipping an Image |
Solution |
O(n^2) |
O(1) |
Easy |
Array |
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| 896 |
Monotonic Array |
Solution |
O(n) |
O(1) |
Easy |
Array |
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| 929 |
Unique Email Addresses |
Solution |
O(n) |
O(n) |
Easy |
String |
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React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent