摘要:
Problem Description We have met so many problems on the tree, so today we will have a query problem on a set of trees. There are N nodes, each node wi 阅读全文
摘要:
Description You are given a tree (an acyclic undirected connected graph) with N nodes, and edges numbered 1, 2, 3...N-1. We will ask you to perfrom so 阅读全文