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1396 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 1249. Minimum Remove to Make Valid Parentheses | Medium | 100% | TopicsStringStack |
| Valid Word Abbreviation | Easy | 96.9% | TopicsTwo PointersString |
| 680. Valid Palindrome II | Easy | 95.7% | TopicsTwo PointersStringGreedy |
| 215. Kth Largest Element in an Array | Medium | 93.9% | TopicsArrayDivide and ConquerSortingHeap (Priority Queue)Quickselect |
| Binary Tree Vertical Order Traversal | Medium | 93.6% | TopicsHash TableTreeDepth-First SearchBreadth-First SearchSortingBinary Tree |
| 1. Two Sum | Easy | 92.9% | TopicsArrayHash Table |
| Basic Calculator II | Medium | 89.5% | TopicsMathStringStack |
| 560. Subarray Sum Equals K | Medium | 88% | TopicsArrayHash TablePrefix Sum |
| Lowest Common Ancestor of a Binary Tree III | Medium | 88% | TopicsHash TableTwo PointersTreeBinary TreeBinary LiftingLowest Common Ancestor |
| 543. Diameter of Binary Tree | Easy | 87.9% | TopicsTreeDepth-First SearchBinary TreeDP on Trees |
| Random Pick with Weight | Medium | 87% | TopicsArrayMathBinary SearchPrefix SumRandomized |
| 88. Merge Sorted Array | Easy | 86.8% | TopicsArrayTwo PointersSorting |
| Nested List Weight Sum | Medium | 86.8% | TopicsDepth-First SearchBreadth-First Search |
| Lowest Common Ancestor of a Binary Tree | Medium | 86.7% | TopicsTreeDepth-First SearchBinary TreeBinary LiftingLowest Common Ancestor |
| 199. Binary Tree Right Side View | Medium | 86.2% | TopicsTreeDepth-First SearchBreadth-First SearchBinary Tree |
| 162. Find Peak Element | Medium | 86.1% | TopicsArrayBinary Search |
| 56. Merge Intervals | Medium | 84.7% | TopicsArraySortingQuicksort |
| Pow(x, n) | Medium | 84.4% | TopicsMathRecursion |
| 121. Best Time to Buy and Sell Stock | Easy | 84.2% | TopicsArrayDynamic Programming |
| 125. Valid Palindrome | Easy | 83.8% | TopicsTwo PointersString |
| Simplify Path | Medium | 83.7% | TopicsStringStack |
| 1762. Buildings With an Ocean View | Medium | 83.4% | TopicsArrayStackMonotonic Stack |
| 347. Top K Frequent Elements | Medium | 82.3% | TopicsArrayHash TableDivide and ConquerSortingHeap (Priority Queue)Bucket SortCountingQuickselect |
| 1091. Shortest Path in Binary Matrix | Medium | 80.2% | TopicsArrayBreadth-First SearchMatrix |
| Next Permutation | Medium | 79.8% | TopicsArrayTwo Pointers |
