Practice problems across 75+ categories
Practice problems frequently asked at Recursion • 50 problems | 11 Easy | 24 Medium | 15 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1 | Add Two Numbers | Medium | Linked ListMathRecursion |
| 2 | All Possible Full Binary Trees | Medium | Dynamic ProgrammingTreeRecursion |
| 3 | Basic Calculator | Hard | MathStringStack |
| 4 | Basic Calculator III | Hard | MathStringStack |
| 5 | Basic Calculator IV | Hard | Hash TableMathString |
| 6 | Binary Search Tree | Medium | TreesBSTRecursion |
| 7 | Binary Tree Mirror | Medium | TreesBinary TreeRecursion |
| 8 | BST to Balanced BST | Medium | TreesBSTArray |
| 9 | Chessboard Region Attacker | Medium | RecursionBacktracking2D Array |
| 10 | Combination Generator with Constraints | Medium | RecursionRecursionConstraints |
| 11 | Count Collisions of Monkeys on a Polygon | Medium | MathRecursion |
| 12 | Count Good Numbers | Medium | MathRecursion |
| 13 | Crossword Filler | Medium | RecursionBacktracking2D Array |
| 14 | Cryptarithmetic Solver | Medium | RecursionBacktrackingLogic |
| 15 | Decode String | Medium | StringStackRecursion |
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