Uber
336 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 815. Bus Routes | Hard | 100% | TopicsArrayHash TableBreadth-First Search |
| Alien Dictionary | Hard | 96.4% | TopicsArrayStringDepth-First SearchBreadth-First SearchGraph TheoryTopological SortDirected Acyclic Graph |
| 1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit | Medium | 93.9% | TopicsArrayQueueSliding WindowHeap (Priority Queue)Ordered SetMonotonic Queue |
| Number of Islands II | Hard | 93.2% | TopicsArrayHash TableUnion-Find |
| Construct Quad Tree | Medium | 89.3% | TopicsArrayDivide and ConquerTreeMatrix |
| 200. Number of Islands | Medium | 88.5% | TopicsArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix |
| 977. Squares of a Sorted Array | Easy | 88.5% | TopicsArrayTwo PointersSorting |
| First Unique Number | Medium | 86.7% | TopicsArrayHash TableDesignQueueData Stream |
| 230. Kth Smallest Element in a BST | Medium | 83.6% | TopicsTreeDepth-First SearchBinary Search TreeBinary Tree |
| Find the Closest Palindrome | Hard | 80.7% | TopicsMathString |
| 2858. Minimum Edge Reversals So Every Node Is Reachable | Hard | 80% | TopicsDynamic ProgrammingDepth-First SearchBreadth-First SearchGraph Theory |
| 79. Word Search | Medium | 79.4% | TopicsArrayStringBacktrackingDepth-First SearchMatrix |
| Design Hit Counter | Medium | 78% | TopicsArrayBinary SearchDesignQueueData Stream |
| Insert Delete GetRandom O(1) | Medium | 75.8% | TopicsArrayHash TableMathDesignRandomized |
| 146. LRU Cache | Medium | 75% | TopicsHash TableLinked ListDesignDoubly-Linked List |
| My Calendar I | Medium | 75% | TopicsArrayBinary SearchDesignSegment TreeOrdered Set |
| 2791. Count Paths That Can Form a Palindrome in a Tree | Hard | 75% | TopicsHash TableBit ManipulationTreeDepth-First Search |
| 121. Best Time to Buy and Sell Stock | Easy | 74.1% | TopicsArrayDynamic Programming |
| 238. Product of Array Except Self | Medium | 72.3% | TopicsArrayPrefix Sum |
| 3161. Block Placement Queries | Hard | 71.4% | TopicsArrayBinary SearchBinary Indexed TreeSegment TreeOrdered Set |
| 212. Word Search II | Hard | 70.4% | TopicsArrayStringBacktrackingTrieMatrix |
| Evaluate Division | Medium | 70.4% | TopicsArrayStringDepth-First SearchBreadth-First SearchUnion-FindGraph TheoryShortest PathBellman–Ford AlgorithmFloyd–Warshall Algorithm |
| 827. Making A Large Island | Hard | 70.4% | TopicsArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix |
| Random Pick with Weight | Medium | 68.3% | TopicsArrayMathBinary SearchPrefix SumRandomized |
| Leftmost Column with at Least a One | Medium | 68.3% | TopicsArrayBinary SearchMatrixInteractive |
