| #4101 | 数字配对SDOI 2016 Round 1 Day 1 | |
| #4102 | 游戏SDOI 2016 Round 1 Day 1 | |
| #4103 | 生成魔咒SDOI 2016 Round 1 Day 2 | |
| #4104 | 排列计数SDOI 2016 Round 1 Day 2 | |
| #4105 | 征途SDOI 2016 Round 1 Day 2 | |
| #4106 | 硬币游戏SDOI 2016 Round 2 Day 1 | |
| #4107 | 墙上的句子SDOI 2016 Round 2 Day 1 | |
| #4108 | 模式字符串SDOI 2016 Round 2 Day 1 | |
| #4109 | 探险路线SDOI 2016 Round 2 Day 2 | |
| #4110 | 齿轮SDOI 2016 Round 2 Day 2 | |
| #4111 | 平凡的骰子SDOI 2016 Round 2 Day 2 | |
| #4112 | 排序SDOI 2015 Round 1 Day 1 | |
| #4113 | 寻宝游戏SDOI 2015 Round 1 Day 1 | |
| #4114 | 序列统计SDOI 2015 Round 1 Day 1 | |
| #4115 | 星际战争SDOI 2015 Round 1 Day 2 | |
| #4116 | 约数个数和SDOI 2015 Round 1 Day 2 | |
| #4117 | 道路修建SDOI 2015 Round 1 Day 2 | |
| #4118 | 音质检测SDOI 2015 Round 2 Day 1 | |
| #4119 | 旅行计划SDOI 2015 Round 2 Day 1 | |
| #4120 | 双旋转字符串SDOI 2015 Round 2 Day 1 | |
| #4121 | 模拟电路SDOI 2015 Round 2 Day 2 | |
| #4122 | 嫁接树SDOI 2015 Round 2 Day 2 | |
| #4123 | 立体图SDOI 2015 Round 2 Day 2 | |
| #4124 | 随机数生成器SDOI 2013 Round 1 Day 1 | |
| #4125 | 森林SDOI 2013 Round 1 Day 1 | |
| #4126 | 直径SDOI 2013 Round 1 Day 1 | |
| #4127 | 方程SDOI 2013 Round 1 Day 2 | |
| #4128 | 费用流SDOI 2013 Round 1 Day 2 | |
| #4129 | 淘金SDOI 2013 Round 1 Day 2 | |
| #4130 | 刺客信条SDOI 2013 Round 2 Day 1 | |
| #4131 | 泉SDOI 2013 Round 2 Day 1 | |
| #4132 | 逃考SDOI 2013 Round 2 Day 1 | |
| #4133 | 项链SDOI 2013 Round 2 Day 2 | |
| #4134 | 保护出题人SDOI 2013 Round 2 Day 2 | |
| #4135 | 城市规划SDOI 2013 Round 2 Day 2 | |
| #4136 | Longge 的问题SDOI 2012 Round 1 Day 1 | |
| #4137 | 棋盘覆盖SDOI 2012 Round 1 Day 1 | |
| #4138 | 走迷宫SDOI 2012 Round 1 Day 1 | |
| #4139 | 最近最远点对SDOI 2012 Round 1 Day 2 | |
| #4140 | 任务安排SDOI 2012 Round 1 Day 2 | |
| #4141 | 体育课SDOI 2012 Round 1 Day 2 | |
| #4142 | 吊灯SDOI 2012 Round 2 Day 1 | |
| #4143 | 体育课SDOI 2012 Round 2 Day 1 | |
| #4144 | 基站建设SDOI 2012 Round 2 Day 1 | |
| #4145 | 拯救小云公主SDOI 2012 Round 2 Day 2 | |
| #4146 | 象棋SDOI 2012 Round 2 Day 2 | |
| #4147 | 集合SDOI 2012 Round 2 Day 2 | |
| #4148 | 打地鼠SDOI 2011 Round 1 Day 1 | |
| #4149 | 计算器SDOI 2011 Round 1 Day 1 | |
| #4150 | 染色SDOI 2011 Round 1 Day 1 | |
| #4151 | 拦截导弹SDOI 2011 Round 1 Day 2 | |
| #4152 | 工作安排 SDOI 2011 Round 1 Day 2 | |
| #4153 | 迷宫探险SDOI 2011 Round 1 Day 2 | |
| #4154 | 黑白棋SDOI 2011 Round 2 Day 1 | |
| #4155 | 消防SDOI 2011 Round 2 Day 1 | |
| #4156 | 火星移民SDOI 2011 Round 2 Day 1 | |
| #4157 | 贪食蛇SDOI 2011 Round 2 Day 2 | |
| #4158 | 保密SDOI 2011 Round 2 Day 2 | |
| #4159 | 消耗战SDOI 2011 Round 2 Day 2 | |
| #4160 | 大陆争霸SDOI 2010 Round 1 Day 1 | |
| #4161 | 外星千足虫SDOI 2010 Round 1 Day 1 | |
| #4162 | 所驼门王的宝藏SDOI 2010 Round 1 Day 1 | |
| #4163 | 地精部落SDOI 2010 Round 1 Day 2 | |
| #4164 | 粟粟的书架SDOI 2010 Round 1 Day 2 | |
| #4165 | 星际竞速SDOI 2010 Round 1 Day 2 | |
| #4166 | 古代猪文SDOI 2010 Round 2 Day 1 | |
| #4167 | 城市规划SDOI 2010 Round 2 Day 1 | |
| #4168 | Hide and SeekSDOI 2010 Round 2 Day 1 | |
| #4169 | 代码拍卖会SDOI 2010 Round 2 Day 2 | |
| #4170 | 猪国杀SDOI 2010 Round 2 Day 2 | |
| #4171 | 魔法猪学院SDOI 2010 Round 2 Day 2 | |
| #4172 | 最优图像 SDOI 2009 Round 1 Day 1 | |
| #4173 | 地图复原SDOI 2009 Round 1 Day 1 | |
| #4174 | 学校食堂SDOI 2009 Round 1 Day 1 | |
| #4175 | 虔诚的墓主人SDOI 2009 Round 1 Day 2 | |
| #4176 | 细胞探索SDOI 2009 Round 1 Day 2 | |
| #4177 | E&DSDOI 2009 Round 1 Day 2 | |
| #4178 | HH 去散步SDOI 2009 Round 2 Day 1 | |
| #4179 | SuperGCDSDOI 2009 Round 2 Day 1 | |
| #4180 | 晨跑SDOI 2009 Round 2 Day 1 | |
| #4181 | HH 的项链SDOI 2009 Round 2 Day 2 | |
| #4182 | Bill 的挑战SDOI 2009 Round 2 Day 2 | |
| #4183 | Elaxia 的路线SDOI 2009 Round 2 Day 2 | |
| #4184 | Amusement ArcadeGCPC 2021 | |
| #4185 | Brexiting and BrenteringGCPC 2021 | |
| #4186 | Card TradingGCPC 2021 | |
| #4187 | Decrypting ZodiacGCPC 2021 | |
| #4188 | Excursion to PorvooGCPC 2021 | |
| #4189 | Flappy BirdGCPC 2021 | |
| #4190 | Grid DeliveryGCPC 2021 | |
| #4191 | Hectic Harbour IIGCPC 2021 | |
| #4192 | Index CaseGCPC 2021 | |
| #4193 | Joined SessionsGCPC 2021 | |
| #4194 | Killjoys' ConferenceGCPC 2021 | |
| #4195 | Looking for WaldoGCPC 2021 | |
| #4196 | Monty's HallGCPC 2021 | |
| #4197 | Natural NavigationGCPC 2021 | |
| #4198 | Alto SingingKTH Challenge 2021 | |
| #4199 | Bus LinesKTH Challenge 2021 | |
| #4200 | Costly ContestKTH Challenge 2021 | |