#include<iostream>
#include<cstdio>
#define inf 0x7fffffff
using namespace std;
inline int read(){
int x=0,f=1;char ch=getchar();
while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
return x*f;
}
int n,m,k,ans,a[2000001],b[2000001],fa[1000001];
inline int find(int x){
return fa[x]==x?x:fa[x]=find(fa[x]);
}
int main(){
n=read();m=read();k=read();
for(int i=1;i<=n;++i)
fa[i]=i;
for......
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