随笔分类 -  图论

图论水题但是没想到
摘要：Note that this is the first problem of the two similar problems. You can hack this problem only if you solve both problems. You are given a tree with  阅读全文
posted @ 2019-08-01 19:48 AKPower 阅读(220) 评论(0) 推荐(0)