Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 2176 | Output Contest Matches | Medium | StringRecursionSimulation |
| 2177 | Pacific Atlantic Water Flow | Medium | ArrayDepth-First SearchBreadth-First Search |
| 2178 | Page Recommendations | Medium | Database |
| 2179 | Page Recommendations II | Hard | Database |
| 2180 | Paint Fence | Medium | Dynamic Programming |
| 2181 | Paint House III | Hard | ArrayDynamic Programming |
| 2182 | Paint House IV | Medium | ArrayDynamic Programming |
| 2183 | Painting a Grid With Three Different Colors | Hard | Dynamic Programming |
| 2184 | Painting the Walls | Hard | ArrayDynamic Programming |
| 2185 | Pairs of Songs With Total Durations Divisible by 60 | Medium | ArrayHash TableCounting |
| 2186 | Palindrome Linked List | Easy | Linked ListTwo PointersStack |
| 2187 | Palindrome Number | Easy | Math |
| 2188 | Palindrome Pairs | Hard | ArrayHash TableString |
| 2189 | Palindrome Partitioning | Medium | StringDynamic ProgrammingBacktracking |
| 2190 | Palindrome Partitioning II | Hard | StringDynamic Programming |
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