Practice problems across 75+ categories
Practice problems frequently asked at Google • 3407 problems | 851 Easy | 1775 Medium | 761 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 391 | Construct Binary Tree from Preorder and Postorder Traversal | Medium | ArrayHash TableDivide and Conquer |
| 392 | Construct Binary Tree from String | Medium | StringStackTree |
| 393 | Construct K Palindrome Strings | Medium | Hash TableStringGreedy |
| 394 | Construct Product Matrix | Medium | ArrayMatrixPrefix Sum |
| 395 | Construct Quad Tree | Medium | ArrayDivide and ConquerTree |
| 396 | Construct Smallest Number From DI String | Medium | StringBacktrackingStack |
| 397 | Construct String from Binary Tree | Medium | StringTreeDepth-First Search |
| 398 | Construct String with Minimum Cost | Hard | ArrayStringDynamic Programming |
| 399 | Construct String with Minimum Cost (Easy) | Unknown | StringTrieDynamic Programming |
| 400 | Construct String With Repeat Limit | Medium | Hash TableStringGreedy |
| 401 | Construct Target Array With Multiple Sums | Hard | ArrayHeap (Priority Queue) |
| 402 | Construct the Lexicographically Largest Valid Sequence | Medium | ArrayBacktracking |
| 403 | Construct the Longest New String | Medium | MathDynamic ProgrammingGreedy |
| 404 | Construct the Minimum Bitwise Array I | Easy | ArrayBit Manipulation |
| 405 | Construct the Minimum Bitwise Array II | Medium | ArrayBit Manipulation |
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