noip这么用不会CE吧

#include<bits/stdc++.h>
using namespace std;
typedef long long LL;
const int N=1e5+1000;
int head[N],num_edge;
struct Edge{int next,to;}ed[N];
void add(int from,int to){
	ed[++num_edge]={head[from],to};//here
	head[from]=num_edge;
}