Palo Alto Networks
50 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| Meeting Rooms | Easy | 49.7% | TopicsArraySortingQuicksort |
| 139. Word Break | Medium | 49.7% | TopicsArrayHash TableStringDynamic ProgrammingTrieMemoizationBrute-Force Search |
| 21. Merge Two Sorted Lists | Easy | 49.7% | TopicsLinked ListRecursion |
| Sliding Window Maximum | Hard | 49.7% | TopicsArrayQueueSliding WindowHeap (Priority Queue)Monotonic QueueRange Minimum/Maximum Query |
| Basic Calculator | Hard | 49.7% | TopicsMathStringStackRecursion |
| 226. Invert Binary Tree | Easy | 49.7% | TopicsTreeDepth-First SearchBreadth-First SearchBinary Tree |
| 20. Valid Parentheses | Easy | 49.7% | TopicsStringStackBracket Sequences |
| Basic Calculator II | Medium | 49.7% | TopicsMathStringStack |
| Multiply Strings | Medium | 49.7% | TopicsMathStringSimulation |
| 112. Path Sum | Easy | 49.7% | TopicsTreeDepth-First SearchBreadth-First SearchBinary Tree |
| 113. Path Sum II | Medium | 49.7% | TopicsBacktrackingTreeDepth-First SearchBinary Tree |
| 332. Reconstruct Itinerary | Hard | 49.7% | TopicsArrayStringDepth-First SearchGraph TheorySortingHeap (Priority Queue)Eulerian CircuitEulerian PathSemi-Eulerian Graph |
| 875. Koko Eating Bananas | Medium | 49.7% | TopicsArrayBinary Search |
| 1239. Maximum Length of a Concatenated String with Unique Characters | Medium | 49.7% | TopicsArrayStringBacktrackingBit Manipulation |
| 5. Longest Palindromic Substring | Medium | 49.7% | TopicsTwo PointersStringDynamic ProgrammingManacher |
| 103. Binary Tree Zigzag Level Order Traversal | Medium | 49.7% | TopicsTreeBreadth-First SearchBinary Tree |
| 355. Design Twitter | Medium | 49.7% | TopicsHash TableLinked ListDesignHeap (Priority Queue) |
| 1235. Maximum Profit in Job Scheduling | Hard | 49.7% | TopicsArrayBinary SearchDynamic ProgrammingSorting |
| 1171. Remove Zero Sum Consecutive Nodes from Linked List | Medium | 49.7% | TopicsHash TableLinked List |
| 543. Diameter of Binary Tree | Easy | 49.7% | TopicsTreeDepth-First SearchBinary TreeDP on Trees |
| 25. Reverse Nodes in k-Group | Hard | 49.7% | TopicsLinked ListRecursion |
| 765. Couples Holding Hands | Hard | 49.7% | TopicsGreedyDepth-First SearchBreadth-First SearchUnion-FindGraph Theory |
| 752. Open the Lock | Medium | 49.7% | TopicsArrayHash TableStringBreadth-First SearchBidirectional Search |
| 125. Valid Palindrome | Easy | 49.7% | TopicsTwo PointersString |
| 121. Best Time to Buy and Sell Stock | Easy | 49.7% | TopicsArrayDynamic Programming |
