Practice problems across 75+ categories
Practice coding problems across all companies and topics • 3600 problems | 879 Easy | 1856 Medium | 842 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1471 | Inversion of Object | Easy | Database |
| 1472 | Invert Binary Tree | Easy | TreeDepth-First SearchBreadth-First Search |
| 1473 | Investments in 2016 | Medium | Database |
| 1474 | IP to CIDR | Medium | StringBit Manipulation |
| 1475 | IPO | Hard | ArrayGreedySorting |
| 1476 | Is Array a Preorder of Some Binary Tree | Medium | StackTreeDepth-First Search |
| 1477 | Is Graph Bipartite? | Medium | Depth-First SearchBreadth-First SearchUnion Find |
| 1478 | Is Object Empty | Easy | JavaScript |
| 1479 | Is Subsequence | Easy | Two PointersStringDynamic Programming |
| 1480 | Island Perimeter | Easy | ArrayDepth-First SearchBreadth-First Search |
| 1481 | Isomorphic Strings | Easy | Hash TableString |
| 1482 | Iterator for Combination | Medium | StringBacktrackingDesign |
| 1483 | Jewels and Stones | Easy | Hash TableString |
| 1484 | Join Two Arrays by ID | Medium | JavaScript |
| 1485 | JSON Deep Equal | Medium | JavaScript |
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