| No. | Problem | Source | Solved | Attempts | Accuracy |
|---|---|---|---|---|---|
 | Bad Hair Day | USACO 2006 November Silver | 3422 | 16643 | 20.56% |
| | Building | 2062 | 7037 | 29.30% | |
| | Tower | KOI 본선 2009 초4/고2 | 3281 | 11381 | 28.83% |
 | Largest Rectangle in a Histogram | Ulm local 2003 | 1869 | 8480 | 22.04% |