Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 856 | Find Most Frequent Vowel and Consonant | Easy | Hash TableStringCounting |
| 857 | Find N Unique Integers Sum up to Zero | Easy | ArrayMath |
| 858 | Find Nearest Point That Has the Same X or Y Coordinate | Easy | Array |
| 859 | Find Number of Coins to Place in Tree Nodes | Hard | Dynamic ProgrammingTreeDepth-First Search |
| 860 | Find Number of Ways to Reach the K-th Stair | Hard | MathDynamic ProgrammingBit Manipulation |
| 861 | Find Numbers with Even Number of Digits | Easy | ArrayMath |
| 862 | Find Occurrences of an Element in an Array | Medium | ArrayHash Table |
| 863 | Find Overlapping Shifts | Unknown | Database |
| 864 | Find Palindrome With Fixed Length | Medium | ArrayMath |
| 865 | Find Pattern in Infinite Stream I | Medium | ArraySliding WindowRolling Hash |
| 866 | Find Pattern in Infinite Stream II | Hard | ArraySliding WindowRolling Hash |
| 867 | Find Peak Calling Hours for Each City | Medium | Database |
| 868 | Find Peak Element | Medium | ArrayBinary Search |
| 869 | Find Permutation | Medium | ArrayStringStack |
| 870 | Find Pivot Index | Easy | ArrayPrefix Sum |
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