Z_sea的博客

题目链接 题目描述 Takahashi is now competing in a programming contest, but he received TLE in a problem where the answer is YES or NO. When he checked the detailed status of the submission, there were N tes...

Master of Random 题目描述 Hakase provides Nano with a problem. There is a rooted tree with values on nodes. For each query,you are asked to calculate the sum of the values in the subtree. However, Nano ...