| 2653 | The Castle | 2/7 | |
| 4022 | Who Ate the Cake? | 0/81 | |
| 4053 | Can you buy them all? | 0/134 | |
| 4059 | The bottom of the ninth | 0/90 | |
| 4111 | Weather Forecast | 0/21 | |
| 4157 | Standing On The Shoulders | 0/23 | |
| 4172 | Spot the Difference | 0/29 | |
| 4181 | Farthest Point | 0/44 | |
| 4185 | Snuke the Cookie Picker | 0/28 | |
| 4254 | 「BalticOI 2011 Day1」打开灯泡 Switch the Lamp On | 0/8 | |
| 4264 | 「一本通 2.1 练习 2」Seek the Name, Seek the Fame | 0/0 | |
| 4278 | 「一本通 2.3 例 2」The XOR Largest Pair | 0/0 | |
| 4284 | 「一本通 2.3 练习 5」The XOR-longest Path | 0/0 | |
| 4734 | [NOIP 2002 提高组] 字串变换（疑似错题） | 0/0 | |
| 4778 | [USACO2.4] 两只塔姆沃斯牛 The Tamworth Two | 0/0 | |
| 4925 | [SCOI2005] 骑士精神 | 0/0 | |
| 4934 | [USACO07MAR] Face The Right Way G | 0/2 | |
| 4936 | [USACO09OCT] Invasion of the Milkweed G | 0/0 | |
| 4958 | [CEOI 2015] 世界冰球锦标赛 (Day2) | 0/0 | |
