6 curated coding interview questions directly asked in Citi technical rounds, sorted by frequency with recency and difficulty diagnostics.
| ID | Problem | Difficulty | Topic | Pattern | Acceptance | Frequency | Recency |
|---|---|---|---|---|---|---|---|
| 150 | Evaluate Reverse Polish Notation | Medium | Core DSA | Implementation / Reasoning | 57.8% | 100.0% | 6m |
| 1 | Two Sum | Easy | Arrays | Sorting / Prefix / Scan; Two Pointers | 57.5% | 100.0% | 6m |
| 121 | Best Time to Buy and Sell Stock | Easy | Core DSA | Implementation / Reasoning | 56.8% | 75.0% | all |
| 48 | Rotate Image | Medium | Arrays | Sorting / Prefix / Scan | 80.1% | 75.0% | all |
| 209 | Minimum Size Subarray Sum | Medium | Arrays | Sorting / Prefix / Scan | 51.7% | 75.0% | all |
| 1944 | Number of Visible People in a Queue | Hard | Stack / Queue | Monotonic Stack / Simulation | 73.1% | 75.0% | all |