MLE 求助，谢谢。

#include<bits/stdc++.h>
using namespace std;
const string b[2]={"No\n","Yes\n"};
short *f=new short[5003];
int fa(int i){
    return (f[i]==i?i:f[i]=fa(f[i]));
}
int n;int m;int p;
int main(){
    cin>>n>>m>>p;
    for(int i=0;i<n;++i){
        f[i]=i+1;
    }
    for(int i=0;i<m;++i){
        int x,y;
        cin>>x>>y;
        f[fa(x)]=fa(y);
    }
    for(int i=0;i<p;++i){
        int x,y;
        cin>>x>>y;
        cout<<b[fa(x)==fa(y)];
    }
}