摘要：
[1635] Explosion 时间限制: 10000 ms 内存限制: 65535 K 问题描述 there is a country which contains n cities connected by n - 1 roads(just like a tree). If you place 阅读全文
摘要：
[1602] Mod Three 时间限制: 5000 ms 内存限制: 65535 K 问题描述 Please help me to solve this problem, if so, LiangChen must have zhongxie! There is a sequence conta 阅读全文