Circle 断一个图是否是一个环. 思路:必有m==n,那么我们用n-1条边能够生成一棵树(即是所有点联通,则用floyd即可),然后看最后一条边的两个点是否是单边(度为一)即可 . #include<cstdio> #include<cstdlib> #include<iostream> #include<memory.h> using namespace std; int du[20],n,m,fa[20]; int x[20],y[20]; bool…
UVA - 10048 Audiophobia Consider yourself lucky! Consider yourself lucky to be still breathing and having fun participating in this contest. But we apprehend that many of your descendants may not have this luxury. For, as you know, we are the dweller…