Practice problems across 75+ categories
Practice problems frequently asked at Google • 3407 problems | 851 Easy | 1775 Medium | 761 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1366 | Interval List Intersections | Medium | ArrayTwo PointersLine Sweep |
| 1367 | Intervals Between Identical Elements | Medium | ArrayHash TablePrefix Sum |
| 1368 | Invalid Transactions | Medium | ArrayHash TableString |
| 1369 | Inverse Coin Change | Medium | ArrayDynamic Programming |
| 1370 | Inversion of Object | Easy | Database |
| 1371 | Invert Binary Tree | Easy | TreeDepth-First SearchBreadth-First Search |
| 1372 | Investments in 2016 | Medium | Database |
| 1373 | IP to CIDR | Medium | StringBit Manipulation |
| 1374 | IPO | Hard | ArrayGreedySorting |
| 1375 | Is Array a Preorder of Some Binary Tree | Medium | StackTreeDepth-First Search |
| 1376 | Is Graph Bipartite? | Medium | Depth-First SearchBreadth-First SearchUnion Find |
| 1377 | Is Object Empty | Easy | JavaScript |
| 1378 | Is Subsequence | Easy | Two PointersStringDynamic Programming |
| 1379 | Island Perimeter | Easy | ArrayDepth-First SearchBreadth-First Search |
| 1380 | Isomorphic Strings | Easy | Hash TableString |
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