摘要：The cows, who always have an inferiority complex about their intelligence, have a new guessing game to sharpen their brains.A designated 'Hay Cow' hid 阅读全文

摘要："题目链接" 考虑正序去除点去掉其所有连边十分复杂，可以倒序离线处理，每次新建一个点，连接其连边，用并查集统计联通块的个数。 附代码 cpp include include include using namespace std; const int MAXN=400000+5; int ans[M 阅读全文