Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 106 | Beautiful Towers I | Medium | ArrayStackMonotonic Stack |
| 107 | Beautiful Towers II | Medium | ArrayStackMonotonic Stack |
| 108 | Before and After Puzzle | Medium | ArrayHash TableString |
| 109 | Best Meeting Point | Hard | ArrayMathSorting |
| 110 | Best Poker Hand | Easy | ArrayHash TableCounting |
| 111 | Best Sightseeing Pair | Medium | ArrayDynamic Programming |
| 112 | Best Team With No Conflicts | Medium | ArrayDynamic ProgrammingSorting |
| 113 | Best Time to Buy and Sell Stock | Easy | ArrayDynamic Programming |
| 114 | Best Time to Buy and Sell Stock II | Medium | ArrayDynamic ProgrammingGreedy |
| 115 | Best Time to Buy and Sell Stock III | Hard | ArrayDynamic Programming |
| 116 | Best Time to Buy and Sell Stock IV | Hard | ArrayDynamic Programming |
| 117 | Best Time to Buy and Sell Stock with Cooldown | Medium | ArrayDynamic Programming |
| 118 | Best Time to Buy and Sell Stock with Transaction Fee | Medium | ArrayDynamic ProgrammingGreedy |
| 119 | Better Compression of String | Medium | Hash TableStringSorting |
| 120 | Big Countries | Easy | Database |
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