Meta
1396 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 217. Contains Duplicate | Easy | 51.1% | TopicsArrayHash TableSorting |
| 235. Lowest Common Ancestor of a Binary Search Tree | Medium | 51.1% | TopicsTreeDepth-First SearchBinary Search TreeBinary TreeBinary LiftingLowest Common Ancestor |
| 136. Single Number | Easy | 50.7% | TopicsArrayBit Manipulation |
| 206. Reverse Linked List | Easy | 50.7% | TopicsLinked ListRecursion |
| Remove Invalid Parentheses | Hard | 50.7% | TopicsStringBacktrackingBreadth-First Search |
| Insert Delete GetRandom O(1) | Medium | 50.7% | TopicsArrayHash TableMathDesignRandomized |
| 295. Find Median from Data Stream | Hard | 50.2% | TopicsTwo PointersDesignSortingHeap (Priority Queue)Data Stream |
| 605. Can Place Flowers | Easy | 50.2% | TopicsArrayGreedy |
| 3Sum Closest | Medium | 49.8% | TopicsArrayTwo PointersSorting |
| 55. Jump Game | Medium | 49.8% | TopicsArrayDynamic ProgrammingGreedy |
| 102. Binary Tree Level Order Traversal | Medium | 49.8% | TopicsTreeBreadth-First SearchBinary Tree |
| Rotate Array | Medium | 49.8% | TopicsArrayMathTwo Pointers |
| 246. Strobogrammatic Number | Easy | 49.8% | TopicsHash TableTwo PointersString |
| 322. Coin Change | Medium | 49.8% | TopicsArrayDynamic ProgrammingBreadth-First SearchKnapsack ProblemComplete Knapsack |
| 540. Single Element in a Sorted Array | Medium | 49.8% | TopicsArrayBinary Search |
| Boundary of Binary Tree | Medium | 49.8% | TopicsTreeDepth-First SearchBinary Tree |
| Multiply Strings | Medium | 49.3% | TopicsMathStringSimulation |
| 27. Remove Element | Easy | 48.9% | TopicsArrayTwo Pointers |
| 35. Search Insert Position | Easy | 48.9% | TopicsArrayBinary Search |
| 51. N-Queens | Hard | 48.9% | TopicsArrayBacktrackingAlgorithm X |
| Sqrt(x) | Easy | 48.9% | TopicsMathBinary SearchNewton's Method |
| Populating Next Right Pointers in Each Node | Medium | 48.9% | TopicsLinked ListTreeDepth-First SearchBreadth-First SearchBinary Tree |
| Best Time to Buy and Sell Stock II | Medium | 48.9% | TopicsArrayDynamic ProgrammingGreedy |
| Two Sum II - Input Array Is Sorted | Medium | 48.4% | TopicsArrayTwo PointersBinary Search |
| Basic Calculator | Hard | 48.4% | TopicsMathStringStackRecursion |
