| 4300 | 绝世好题 | By Oxer | 1900 | 3484 |
| 4302 | Hdu 5301 Buildings | | 91 | 177 |
| 4303 | 数列 | | 89 | 390 |
| 4307 | Maishroom & Class | | 9 | 18 |
| 4308 | Maishroom & Table | | 28 | 63 |
| 4309 | Maishroom & Mushroom | | 11 | 100 |
| 4310 | 跳蚤 | | 635 | 1427 |
| 4311 | 向量 | | 273 | 707 |
| 4312 | 立方体 | | 41 | 81 |
| 4313 | 三维积木 | | 79 | 137 |
| 4314 | 倍数？倍数！ | | 116 | 174 |
| 4315 | queue | | 45 | 95 |
| 4316 | 小C的独立集 | | 568 | 1010 |
| 4317 | Atm的树 | | 181 | 296 |
| 4318 | OSU! | | 1462 | 1849 |
| 4320 | ShangHai2006 Homework | | 616 | 1320 |
| 4321 | queue2 | | 454 | 766 |
| 4322 | 压缩规则 | | 7 | 19 |
| 4324 | tjoi2012 炸弹 | | 8 | 22 |
| 4325 | NOIP2015 斗地主 | | 941 | 1406 |
| 4326 | NOIP2015 运输计划 | | 1590 | 2478 |
| 4327 | JSOI2012 玄武密码 | | 441 | 997 |
| 4330 | JSOI2012 爱之项链 | | 41 | 77 |
| 4336 | BJOI2015 骑士的旅行 | | 208 | 496 |
| 4337 | BJOI2015 树的同构 | | 714 | 1721 |
| 4338 | BJOI2015 糖果 | | 116 | 233 |
| 4339 | BJOI2015 回家的路 | | 7 | 48 |
| 4340 | BJOI2015 隐身术 | | 55 | 181 |
| 4344 | [POI2016]Hydrorozgrywka | 鸣谢Claris | 14 | 75 |
| 4345 | [POI2016]Korale | 鸣谢Claris | 254 | 760 |
| 4346 | [POI2016]Nadajniki | 鸣谢Claris | 83 | 207 |
| 4347 | [POI2016]Nim z utrudnieniem | 鸣谢Claris | 360 | 952 |
| 4348 | [POI2016]Park wodny | 鸣谢Claris | 41 | 132 |
| 4349 | 最小树形图 | | 347 | 820 |
| 4353 | Play with tree | | 70 | 154 |
| 4354 | Magic cube | | 6 | 18 |
| 4355 | Play with sequence | 鸣谢Claris | 179 | 533 |
| 4357 | Point | | 2 | 15 |
| 4358 | permu | By sumix173 | 378 | 1108 |
| 4359 | Exp | By sumix173 | 178 | 225 |
| 4360 | achievement | Lydsy3953 Control | 11 | 38 |
| 4361 | isn | | 542 | 1089 |
| 4364 | [IOI2014]wall砖墙 | 鸣谢yts1999上传 | 225 | 415 |
| 4365 | [IOI2014]gondola缆车 | 鸣谢yts1999上传 | 0 | 35 |
| 4366 | [IOI2014]friend朋友 | 鸣谢yts1999上传 | 37 | 57 |
| 4367 | [IOI2014]holiday假期 | 鸣谢yts1999上传 | 180 | 594 |
| 4368 | [IOI2015]boxes纪念品盒 | 鸣谢yts1999上传 | 108 | 253 |
| 4370 | [IOI2015]horses马 | 鸣谢yts1999上传 | 43 | 145 |
| 4371 | [IOI2015]sorting排序 | 鸣谢yts1999上传 鸣谢mcfx提供SPJ | 34 | 124 |
| 4372 | 烁烁的游戏 | | 419 | 1137 |
| 4373 | 算术天才⑨与等差数列 | | 571 | 2332 |
| 4389 | ZYB and Trees | jiangshibiao&&gyz_gyz | 45 | 106 |
| 4390 | [Usaco2015 dec]Max Flow | Platinum鸣谢Claris提供译文 | 571 | 874 |
| 4391 | [Usaco2015 dec]High Card Low Card | Platinum鸣谢Claris提供译文 | 227 | 451 |
| 4392 | [Usaco2015 dec]Counting Haybales | Platinum鸣谢Claris提供译文 | 146 | 307 |
| 4393 | [Usaco2015 Dec]Fruit Feast | Gold鸣谢Claris提供译文 | 184 | 292 |
| 4394 | [Usaco2015 dec]Bessie | Gold鸣谢Claris提供译文 | 64 | 159 |
| 4395 | [Usaco2015 dec]Switching on the Lights | Silver鸣谢Claris提供译文 | 131 | 291 |
| 4396 | [Usaco2015 dec]High Card Wins | Silver鸣谢Claris提供译文 | 181 | 284 |
| 4397 | [Usaco2015 dec]Breed Counting | Silver鸣谢Claris提供译文 | 289 | 401 |
| 4398 | 福慧双修 | | 272 | 501 |
| 4399 | 魔法少女LJJ | By liuchenrui | 294 | 1325 |
