Practice problems across 75+ categories
Practice problems frequently asked at Counting • 166 problems | 58 Easy | 87 Medium | 20 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 61 | First Letter to Appear Twice | Easy | Hash TableStringBit Manipulation |
| 62 | First Unique Character in a String | Easy | Hash TableStringQueue |
| 63 | Furthest Point From Origin | Easy | StringCounting |
| 64 | Identify the Largest Outlier in an Array | Medium | ArrayHash TableCounting |
| 65 | Increasing Decreasing String | Easy | Hash TableStringCounting |
| 66 | Intersection of Multiple Arrays | Easy | ArrayHash TableSorting |
| 67 | Intersection of Three Sorted Arrays | Easy | ArrayHash TableBinary Search |
| 68 | Kth Distinct String in an Array | Easy | ArrayHash TableString |
| 69 | Largest Color Value in a Directed Graph | Hard | Hash TableDynamic ProgrammingGraph |
| 70 | Largest Combination With Bitwise AND Greater Than Zero | Medium | ArrayHash TableBit Manipulation |
| 71 | Largest Palindromic Number | Medium | Hash TableStringGreedy |
| 72 | Largest Values From Labels | Medium | ArrayHash TableGreedy |
| 73 | Least Number of Unique Integers after K Removals | Medium | ArrayHash TableGreedy |
| 74 | Letter Tile Possibilities | Medium | Hash TableStringBacktracking |
| 75 | Linked List Frequency | Unknown | Hash TableLinked ListCounting |
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