| # |
QUESTION |
DIFFICULTY |
TOPICS |
COMPANIES |
| 1 | Two Sum | EASY | ARRAY | Google, Meta, Amazon |
| 2 | Valid Parentheses | EASY | STACK | Microsoft, Netflix |
| 3 | Merge Two Sorted Lists | EASY | LINKED LIST | Amazon, Microsoft |
| 4 | Best Time Buy/Sell Stock | EASY | ARRAY | Amazon, Google |
| 5 | Valid Palindrome | EASY | STRING | Meta, Adobe |
| 6 | Invert Binary Tree | EASY | TREE | Google, Amazon |
| 7 | Valid Anagram | EASY | STRING | Uber, Amazon |
| 8 | Binary Search | EASY | SEARCH | Google, Meta |
| 9 | Flood Fill | EASY | GRAPH | Microsoft, Google |
| 10 | LCA of BST | EASY | BST | LinkedIn, Amazon |
| 11 | Balanced Binary Tree | EASY | TREE | Amazon, Bloomberg |
| 12 | Linked List Cycle | EASY | LINKED LIST | Microsoft, Apple |
| 13 | Queue via Stacks | EASY | STACK | Microsoft, Bloomberg |
| 14 | First Bad Version | EASY | SEARCH | Meta, Google |
| 15 | Ransom Note | EASY | HASH | Amazon, Adobe |
| 16 | Climbing Stairs | EASY | DP | Amazon, Google |
| 17 | Longest Palindrome | EASY | STRING | Amazon, Microsoft |
| 18 | Reverse Linked List | EASY | LINKED LIST | Adobe, Nvidia |
| 19 | Majority Element | EASY | ARRAY | Microsoft, Amazon |
| 20 | Add Binary | EASY | BINARY | Meta, Google |
| 21 | Diameter of Binary Tree | EASY | TREE | Amazon, Meta |
| 22 | Middle of Linked List | EASY | LINKED LIST | Adobe, Microsoft |
| 23 | Max Depth of Tree | EASY | TREE | LinkedIn, Amazon |
| 24 | Contains Duplicate | EASY | ARRAY | Apple, Google |
| 25 | Maximum Subarray | MEDIUM | DP | Microsoft, LinkedIn |
| 26 | Insert Interval | MEDIUM | ARRAY | Google, Meta |
| 27 | 01 Matrix | MEDIUM | GRAPH | Google, Amazon |
| 28 | K Closest Points | MEDIUM | HEAP | Amazon, Google |
| 29 | Longest Substring | MEDIUM | STRING | Bloomberg, Amazon |
| 30 | 3Sum | MEDIUM | ARRAY | Meta, Microsoft |
| 31 | Level Order Traversal | MEDIUM | TREE | Amazon, Microsoft |
| 32 | Clone Graph | MEDIUM | GRAPH | Microsoft, Google |
| 33 | Evaluate RPN | MEDIUM | STACK | LinkedIn, Amazon |
| 34 | Course Schedule | MEDIUM | GRAPH | Uber, Google |
| 35 | Implement Trie | MEDIUM | TRIE | Amazon, Google |
| 36 | Coin Change | MEDIUM | DP | Apple, Goldman Sachs |
| 37 | Product Except Self | MEDIUM | ARRAY | Amazon, Microsoft |
| 38 | Min Stack | MEDIUM | STACK | Amazon, Bloomberg |
| 39 | Validate BST | MEDIUM | BST | Amazon, Microsoft |
| 40 | Number of Islands | MEDIUM | GRAPH | Amazon, Meta |
| 41 | Rotting Oranges | MEDIUM | GRAPH | Amazon, Uber |
| 42 | Search Rotated Array | MEDIUM | SEARCH | Meta, Google |
| 43 | Combination Sum | MEDIUM | ARRAY | Amazon, Microsoft |
| 44 | Permutations | MEDIUM | ARRAY | Google, Amazon |
| 45 | Merge Intervals | MEDIUM | ARRAY | Meta, Microsoft |
| 46 | LCA Binary Tree | MEDIUM | TREE | Meta, Amazon |
| 47 | Time Based Store | MEDIUM | DESIGN | Google, Netflix |
| 48 | Accounts Merge | MEDIUM | GRAPH | Meta, Google |
| 49 | Sort Colors | MEDIUM | ARRAY | Microsoft, Amazon |
| 50 | Word Break | MEDIUM | DP | Meta, Amazon |
| 51 | Partition Equal Sum | MEDIUM | DP | Amazon, Google |
| 52 | Atoi | MEDIUM | STRING | Microsoft, Goldman Sachs |
| 53 | Spiral Matrix | MEDIUM | MATRIX | Microsoft, Amazon |
| 54 | Subsets | MEDIUM | ARRAY | Meta, Amazon |
| 55 | Tree Right Side View | MEDIUM | TREE | Amazon, Meta |
| 56 | Longest Palindromic | MEDIUM | STRING | Amazon, Google |
| 57 | Unique Paths | MEDIUM | DP | Google, Amazon |
| 58 | Construct Tree | MEDIUM | TREE | Amazon, Microsoft |
| 59 | Container Most Water | MEDIUM | ARRAY | Google, Amazon |
| 60 | Letter Combos | MEDIUM | STRING | Amazon, Meta |
| 61 | Word Search | MEDIUM | ARRAY | Amazon, Microsoft |
| 62 | Find All Anagrams | MEDIUM | STRING | Amazon, Meta |
| 63 | Min Height Trees | MEDIUM | GRAPH | Google, Uber |
| 64 | Task Scheduler | MEDIUM | HEAP | Amazon, Meta |
| 65 | LRU Cache | MEDIUM | DESIGN | Amazon, Microsoft, Meta |
| 66 | Kth Smallest BST | MEDIUM | BST | Amazon, Microsoft |
| 67 | Min Window Substr | HARD | STRING | Meta, Amazon, Google |
| 68 | Serialize Tree | HARD | DESIGN | Google, Amazon |
| 69 | Trapping Rain Water | HARD | ARRAY | Meta, Goldman Sachs |
| 70 | Median Data Stream | HARD | HEAP | Google, Amazon |
| 71 | Word Ladder | HARD | GRAPH | Amazon, Google |
| 72 | Basic Calculator | HARD | STACK | Microsoft, Google |
| 73 | Job Scheduling | HARD | DP | Google, Amazon |
| 74 | Merge K Sorted Lists | HARD | HEAP | Amazon, Meta, Google |
| 75 | Largest Rectangle | HARD | STACK | Microsoft, Amazon |
