Prefix Sums Problems
189 Prefix Sums problems on LeetCode, a Arrays & Hashing 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 | Product of Array Except Self | Easy | 1305 | 91 | |
| 2 | Subarray Sum Equals K | Easy | 1324 | 91 | Frequency Counting / Hash Map Lookup |
| 3 | Range Sum Query - Immutable | Easy | 1028 | 90 | |
| 4 | Range Sum Query 2D - Immutable | Medium | 1407 | 87 | Matrix Traversal (Diagonal, Valid Sudoku, etc) |
| 5 | Range AdditionPREMIUM | Easy | 1371 | 82 |
MORE ARRAYS & HASHING PATTERNS
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