摘要：
507. Treediff Time limit per test: 0.25 second(s) Memory limit: 262144 kilobytes input: standard output: standard Andrew has just made a breakthrough 阅读全文
摘要：
You are given a rooted tree with root in vertex 1. Each vertex is coloured in some colour. Let's call colour c dominating in the subtree of vertex v i 阅读全文