Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 136 | Before and After Puzzle | Medium | ArrayHash TableString |
| 137 | Best Meeting Point | Hard | ArrayMathSorting |
| 138 | Best Poker Hand | Easy | ArrayHash TableCounting |
| 139 | Best Position for a Service Centre | Hard | ArrayMathGeometry |
| 140 | Best Sightseeing Pair | Medium | ArrayDynamic Programming |
| 141 | Best Team With No Conflicts | Medium | ArrayDynamic ProgrammingSorting |
| 142 | Best Time to Buy and Sell Stock | Easy | ArrayDynamic Programming |
| 143 | Best Time to Buy and Sell Stock II | Medium | ArrayDynamic ProgrammingGreedy |
| 144 | Best Time to Buy and Sell Stock III | Hard | ArrayDynamic Programming |
| 145 | Best Time to Buy and Sell Stock IV | Hard | ArrayDynamic Programming |
| 146 | Best Time to Buy and Sell Stock with Cooldown | Medium | ArrayDynamic Programming |
| 147 | Best Time to Buy and Sell Stock with Transaction Fee | Medium | ArrayDynamic ProgrammingGreedy |
| 148 | Better Compression of String | Medium | Hash TableStringSorting |
| 149 | Big Countries | Easy | Database |
| 150 | Biggest Single Number | Easy | Database |
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