vjudge

https://vjudge.net/problem/HihoCoder-1121

#include
#include
#include
#include
#define N 10000010
using namespace std;
vectorE[N];
int v[N],i,j,k,n,tt,s,t,m,f;
bool dfs(int x) {
	for (int i=0; i

 

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