| P4312 | P4312 [COI 2009] OTOCI |
| P4313 | P4313 文理分科 |
| P4314 | P4314 CPU 监控 |
| P4315 | P4315 月下“毛景树” |
| P4316 | P4316 绿豆蛙的归宿 |
| P4317 | P4317 花神的数论题 |
| P4318 | P4318 完全平方数 |
| P4320 | P4320 道路相遇 |
| P4322 | P4322 [JSOI2016] 最佳团体 |
| P4329 | P4329 [COCI 2006/2007 #1] Bond |
| P4331 | P4331 [BalticOI 2004] Sequence (Day1) |
| P4332 | P4332 [SHOI2014] 三叉神经树 |
| P4336 | P4336 [SHOI2016] 黑暗前的幻想乡 |
| P4338 | P4338 [ZJOI2018] 历史 |
| P4339 | P4339 [ZJOI2018] 迷宫 |
| P4340 | P4340 [SHOI2016] 随机序列 |
| P4342 | P4342 [IOI 1998] Polygon |
| P4343 | P4343 [SHOI2015] 自动刷题机 |
| P4344 | P4344 [SHOI2015] 脑洞治疗仪 |
| P4345 | P4345 [SHOI2015] 超能粒子炮·改 |
| P4351 | P4351 [CERC2015] Frightful Formula |
| P4360 | P4360 [CEOI 2004] 锯木厂选址 |
| P4362 | P4362 [NOI2002] 贪吃的九头龙 |
| P4363 | P4363 [九省联考 2018] 一双木棋 chess |
| P4364 | P4364 [九省联考 2018] IIIDX |
| P4366 | P4366 [Code+#4] 最短路 |
| P4370 | P4370 [Code+#4] 组合数问题2 |
| P4374 | P4374 [USACO18OPEN] Disruption P |
| P4375 | P4375 [USACO18OPEN] Out of Sorts G |
| P4376 | P4376 [USACO18OPEN] Milking Order G |
| P4377 | P4377 [USACO18OPEN] Talent Show G |
| P4380 | P4380 [USACO18OPEN] Multiplayer Moo S |
| P4381 | P4381 [IOI 2008] Island |
| P4383 | P4383 [八省联考 2018] 林克卡特树 |
| P4384 | P4384 [八省联考 2018] 制胡窜 |
| P4388 | P4388 付公主的矩形 |
| P4389 | P4389 付公主的背包 |
| P4391 | P4391 [BalticOI 2009] Radio Transmission 无线传输 |
| P4395 | P4395 [BalticOI 2003] Gem 气垫车 |
| P4396 | P4396 [AHOI2013] 作业 |
| P4397 | P4397 [JLOI2014] 聪明的燕姿 |
| P4401 | P4401 [IOI 2007] Miners 矿工配餐 |
| P4402 | P4402 [CERC2007] robotic sort 机械排序 |
| P4407 | P4407 [JSOI2009] 电子字典 |
| P4408 | P4408 [NOI2003] 逃学的小孩 / 数据生成器 |
| P4409 | P4409 [ZJOI2006] 皇帝的烦恼 |
| P4411 | P4411 [BJWC2010] 取数游戏 |
| P4421 | P4421 [COCI 2017/2018 #1] Lozinke |
| P4422 | P4422 [COCI 2017/2018 #1] Deda |
| P4424 | P4424 [HNOI/AHOI2018] 寻宝游戏 |
| P4426 | P4426 [HNOI/AHOI2018] 毒瘤 |
| P4427 | P4427 [BJOI2018] 求和 |
| P4429 | P4429 [BJOI2018] 染色 |
| P4433 | P4433 [COCI 2009/2010 #1] ALADIN |
| P4435 | P4435 [COCI 2017/2018 #2] Garaža |
| P4437 | P4437 [HNOI/AHOI2018] 排列 |
| P4438 | P4438 [HNOI/AHOI2018] 道路 |
| P4446 | P4446 [AHOI2018初中组] 根式化简 |
| P4447 | P4447 [AHOI2018初中组] 分组 |
| P4448 | P4448 [AHOI2018初中组] 球球的排列 |
| P4449 | P4449 于神之怒加强版 |
| P4450 | P4450 双亲数 |
| P4451 | P4451 [国家集训队] 整数的lqp拆分 |
| P4454 | P4454 [CQOI2018] 破解D-H协议 |
| P4457 | P4457 [BJOI2018] 治疗之雨 |
| P4458 | P4458 [BJOI2018] 链上二次求和 |
| P4459 | P4459 [BJOI2018] 双人猜数游戏 |
| P4460 | P4460 [CQOI2018] 解锁屏幕 |
| P4461 | P4461 [CQOI2018] 九连环 |
| P4462 | P4462 [CQOI2018] 异或序列 |
| P4463 | P4463 [集训队互测 2012] calc |
| P4464 | P4464 [国家集训队] JZPKIL |
| P4467 | P4467 [SCOI2007] k短路 |
| P4480 | P4480 [BJWC2018] 餐巾计划问题 |
| P4482 | P4482 [BJWC2018] Border 的四种求法 |
| P4491 | P4491 [HAOI2018] 染色 |
| P4492 | P4492 [HAOI2018] 苹果树 |
| P4493 | P4493 [HAOI2018] 字串覆盖 |
| P4494 | P4494 [HAOI2018] 反色游戏 |
| P4495 | P4495 [HAOI2018] 奇怪的背包 |
| P4497 | P4497 [WC2011] 拼点游戏 |
| P4500 | P4500 [ZJOI2018] 树 |
| P4501 | P4501 [ZJOI2018] 胖 |
| P4503 | P4503 [CTSC2014] 企鹅 QQ |
| P4512 | P4512 【模板】多项式除法 |
| P4513 | P4513 小白逛公园 |
| P4514 | P4514 上帝造题的七分钟 |
| P4516 | P4516 [JSOI2018] 潜入行动 |
| P4525 | P4525 【模板】自适应辛普森法 1 |
| P4526 | P4526 【模板】自适应辛普森法 2 |
| P4536 | P4536 [CQOI2007] 三角形 |
| P4539 | P4539 [SCOI2006] zh_tree |
| P4544 | P4544 [USACO10NOV] Buying Feed G |
| P4546 | P4546 [THUWC 2017] 在美妙的数学王国中畅游 |
| P4548 | P4548 [CTSC2006] 歌唱王国 |
| P4550 | P4550 收集邮票 |
| P4551 | P4551 最长异或路径 |
| P4552 | P4552 [Poetize6] IncDec Sequence |
| P4554 | P4554 小明的游戏 |
| P4555 | P4555 [国家集训队] 最长双回文串 |
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