Modular Arithmetic Problems
18 Modular Arithmetic problems on LeetCode, a Math & Geometry interview pattern, ranked by importance (how often it comes up in real interviews). Difficulty (ELO) and importance shown per problem.
| # | PROBLEM | DIFF | ELO | IMP | PATTERNS |
|---|---|---|---|---|---|
| 1 | Count Good Numbers | Medium | 1675 | 52 | General Math |
| 2 | Number of Ways to Divide a Long Corridor | Hard | 1915 | 52 | Combinatorics · Linear Recurrence DP |
| 3 | Find the Divisibility Array of a String | Medium | 1541 | 45 | Prefix Sums |
| 4 | Fancy Sequence | Hard | 2476 | 42 | Prefix Sums · Frequency Counting / Hash Map Lookup |
| 5 | Smallest All-Ones Multiple | Medium | 1593 | 41 | Frequency Counting / Hash Map Lookup |
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