Practice problems across 75+ categories
Practice problems frequently asked at Hash Table • 719 problems | 168 Easy | 418 Medium | 127 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 541 | Number of Substrings Containing All Three Characters | Medium | Hash TableStringSliding Window |
| 542 | Number of Substrings With Fixed Ratio | Medium | Hash TableMathString |
| 543 | Number of Unequal Triplets in Array | Easy | ArrayHash TableSorting |
| 544 | Number of Unique Flavors After Sharing K Candies | Medium | ArrayHash TableSliding Window |
| 545 | Number of Valid Words for Each Puzzle | Hard | ArrayHash TableString |
| 546 | Number of Ways Where Square of Number Is Equal to Product of Two Numbers | Medium | ArrayHash TableMath |
| 547 | Number of Wonderful Substrings | Medium | Hash TableStringBit Manipulation |
| 548 | Odd String Difference | Easy | ArrayHash TableString |
| 549 | Online Election | Medium | ArrayHash TableBinary Search |
| 550 | Open the Lock | Medium | ArrayHash TableString |
| 551 | Operations on Tree | Medium | ArrayHash TableTree |
| 552 | Optimal Partition of String | Medium | Hash TableStringGreedy |
| 553 | Pairs of Songs With Total Durations Divisible by 60 | Medium | ArrayHash TableCounting |
| 554 | Palindrome Pairs | Hard | ArrayHash TableString |
| 555 | Palindrome Permutation | Easy | Hash TableStringBit Manipulation |
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