摘要：
Time limit : 2sec / Memory limit : 256MB Problem Statement There are two rooted trees, each with $N$ vertices. The vertices of each tree are numbered 阅读全文
摘要：
Time limit : 2sec / Memory limit : 256MB Problem Statement Snuke got a grid from his mother, as a birthday present. The grid has $H$ rows and $W$ colu 阅读全文
摘要：
Time limit : 2sec / Memory limit : 256MB Problem Statement Snuke got an integer sequence from his mother, as a birthday present. The sequence has $N$ 阅读全文