6 curated coding interview questions directly asked in Att technical rounds, sorted by frequency with recency and difficulty diagnostics.
| ID | Problem | Difficulty | Topic | Pattern | Acceptance | Frequency | Recency |
|---|---|---|---|---|---|---|---|
| 1695 | Maximum Erasure Value | Medium | Arrays | Sorting / Prefix / Scan | 64.3% | 100.0% | 6m |
| 611 | Valid Triangle Number | Medium | Strings | Hashing / Sliding Window | 56.9% | 87.5% | all |
| 20 | Valid Parentheses | Easy | Strings | Hashing / Sliding Window | 44.2% | 87.5% | all |
| 3 | Longest Substring Without Repeating Characters | Medium | Strings; Trees | Hashing / Sliding Window; DFS / BFS; Sliding Window | 39.1% | 75.0% | 6m |
| 48 | Rotate Image | Medium | Arrays | Sorting / Prefix / Scan | 80.1% | 62.5% | all |
| 2964 | Number of Divisible Triplet Sums | Medium | Arrays | Sorting / Prefix / Scan | 67.6% | 62.5% | all |