Practice problems across 75+ categories
Practice coding problems across all companies and topics • 3600 problems | 879 Easy | 1856 Medium | 842 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 241 | Different Ways to Add Parentheses | Medium | MathStringDynamic Programming |
| 242 | Valid Anagram | Easy | Hash TableStringSorting |
| 243 | Shortest Word Distance | Easy | ArrayString |
| 244 | Shortest Word Distance II | Medium | ArrayHash TableTwo Pointers |
| 245 | Shortest Word Distance III | Easy | ArrayString |
| 246 | Strobogrammatic Number | Medium | Hash TableTwo PointersString |
| 247 | Strobogrammatic Number II | Medium | ArrayStringRecursion |
| 248 | Strobogrammatic Number III | Hard | ArrayStringRecursion |
| 249 | Group Shifted Strings | Medium | ArrayHash TableString |
| 250 | Count Univalue Subtrees | Medium | TreeDepth-First SearchBinary Tree |
| 251 | Flatten 2D Vector | Medium | ArrayTwo PointersDesign |
| 252 | Meeting Rooms | Easy | ArraySorting |
| 253 | Meeting Rooms II | Medium | ArrayTwo PointersGreedy |
| 254 | Factor Combinations | Medium | Backtracking |
| 255 | Verify Preorder Sequence in Binary Search Tree | Medium | ArrayStackTree |
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