| P4778 | P4778 Counting swaps |
| P4781 | P4781 【模板】拉格朗日插值 |
| P4782 | P4782 【模板】2-SAT |
| P4783 | P4783 【模板】矩阵求逆 |
| P4785 | P4785 [BalticOI 2016] 交换 (Day2) |
| P4786 | P4786 [BalkanOI 2018] Election |
| P4788 | P4788 [BalkanOI 2018] Parentrises |
| P4795 | P4795 [BalticOI 2018] 基因工程 |
| P4798 | P4798 [CEOI 2015] 卡尔文球锦标赛 (Day1) |
| P4799 | P4799 [CEOI 2015] 世界冰球锦标赛 (Day2) |
| P4801 | P4801 [CCO 2015] 饥饿的狐狸 |
| P4802 | P4802 [CCO 2015] 路短最 |
| P4804 | P4804 [CCC 2016] 生命中的圆 |
| P4805 | P4805 [CCC 2016] 合并饭团 |
| P4808 | P4808 [CCC 2018] 平衡树 |
| P4809 | P4809 [CCC 2018] 最大战略储备 |
| P4819 | P4819 [中山市选] 杀人游戏 |
| P4822 | P4822 [BJWC2012] 冻结 |
| P4824 | P4824 [USACO15FEB] Censoring S |
| P4827 | P4827 [集训队互测 2011] Crash 的文明世界 |
| P4828 | P4828 Nagisa loves Tomoya |
| P4829 | P4829 kry loves 2048 |
| P4831 | P4831 Scarlet loves WenHuaKe |
| P4832 | P4832 珈百璃堕落的开始 |
| P4834 | P4834 萨塔尼亚的期末考试 |
| P4839 | P4839 P 哥的桶 |
| P4841 | P4841 [集训队作业2013] 城市规划 |
| P4843 | P4843 清理雪道 |
| P4844 | P4844 LJJ爱数数 |
| P4845 | P4845 LJJ 爱数树 |
| P4849 | P4849 寻找宝藏 |
| P4853 | P4853 yyf hates dagequ |
| P4854 | P4854 MloVtry的咸鱼树 |
| P4859 | P4859 已经没有什么好害怕的了 |
| P4861 | P4861 按钮 |
| P4867 | P4867 Gty的妹子序列 |
| P4868 | P4868 Preprefix sum |
| P4869 | P4869 albus就是要第一个出场 |
| P4871 | P4871 Oier们的镜子(mirror) |
| P4873 | P4873 [USACO14DEC] Cow Jog G |
| P4877 | P4877 [USACO14FEB] Cow Decathlon G |
| P4878 | P4878 [USACO05DEC] Layout G |
| P4879 | P4879 ycz的妹子 |
| P4884 | P4884 多少个 1? |
| P4885 | P4885 灭顶之灾 |
| P4887 | P4887 【模板】莫队二次离线 / 第十四分块(前体) |
| P4890 | P4890 Never·island |
| P4897 | P4897 【模板】最小割树(Gomory-Hu Tree) |
| P4899 | P4899 [IOI 2018] werewolf 狼人 |
| P4905 | P4905 报纸 |
| P4909 | P4909 [USACO06MAR] Ski Lift G |
| P4916 | P4916 [MtOI2018] 魔力环 |
| P4921 | P4921 [MtOI2018] 情侣?给我烧了! |
| P4926 | P4926 [1007] 倍杀测量者 |
| P4929 | P4929 【模板】舞蹈链(DLX) |
| P4931 | P4931 [MtOI2018] 情侣?给我烧了!(加强版) |
| P4932 | P4932 浏览器 |
| P4933 | P4933 大师 |
| P4934 | P4934 礼物 |
| P4938 | P4938 War1 |
| P4939 | P4939 Agent2 |
| P4940 | P4940 Portal 2 |
| P4941 | P4941 War2 |
| P4943 | P4943 密室 |
| P4948 | P4948 数列求和 |
| P4949 | P4949 最短距离 |
| P4951 | P4951 [USACO01OPEN] Earthquake |
| P4952 | P4952 [USACO04MAR] Financial Aid |
| P4953 | P4953 [USACO02FEB] Cow Cycling |
| P4954 | P4954 [USACO09OPEN] Tower of Hay G |
| P4962 | P4962 朋也与光玉 |
| P4964 | P4964 绫小路的特别考试 |
| P4965 | P4965 薇尔莉特的打字机 |
| P4978 | P4978 赌神:决斗 |
| P4980 | P4980 【模板】Pólya 定理 |
| P4983 | P4983 忘情 |
| P4987 | P4987 回文项链 |
| P4989 | P4989 二进制之谜 |
| P4998 | P4998 信号站 |
| P4999 | P4999 烦人的数学作业 |
| P5003 | P5003 跳舞的线 - 乱拐弯 |
| P5004 | P5004 专心OI - 跳房子 |
| P5007 | P5007 DDOSvoid 的疑惑 |
| P5008 | P5008 [yLOI2018] 锦鲤抄 |
| P5010 | P5010 HMR的LIS Ⅲ |
| P5011 | P5011 水の造题 |
| P5017 | P5017 [NOIP 2018 普及组] 摆渡车 |
| P5018 | P5018 [NOIP 2018 普及组] 对称二叉树 |
| P5020 | P5020 [NOIP 2018 提高组] 货币系统 |
| P5021 | P5021 [NOIP 2018 提高组] 赛道修建 |
| P5022 | P5022 [NOIP 2018 提高组] 旅行 |
| P5023 | P5023 [NOIP 2018 提高组] 填数游戏 |
| P5024 | P5024 [NOIP 2018 提高组] 保卫王国 |
| P5025 | P5025 [SNOI2017] 炸弹 |
| P5026 | P5026 Lycanthropy |
| P5027 | P5027 Barracuda |
| P5028 | P5028 Annihilate |
| P5029 | P5029 T'ill It's Over |
| P5043 | P5043 【模板】树同构 / [BJOI2015] 树的同构 |
| P5044 | P5044 [IOI 2018] meetings 会议 |