全部RE

#include<bits/stdc++.h>
using namespace std;
int n,m,p;
int M[50005];
int huoquguanxi(int x){
	return M[x]==x?x:M[x]=huoquguanxi(M[x]);
}
int shezhiguanxi(int x,int y){
	int X,Y;
	X=huoquguanxi(x);
	Y=huoquguanxi(y);
	M[X]=Y;
}
int chushihuaguanxi(int N){
	for(int i=1;i<=n;i++){
		M[i]=i;
	}
}
int main(){
	cin>>n>>m>>p;
	for(int i=0;i<m;i++){
		int qa,qb;
		cin>>qa>>qb;
		shezhiguanxi(qa,qb);
	}
	for(int i=0;i<p;i++){
		int qa,qb;
		qa=huoquguanxi(qa);
		qb=huoquguanxi(qb);
		if(qa==qb){
			cout<<"Yes"<<endl;
		}else{
			cout<<"No"<<endl;
		}
	}
	return 0;
}