老师教的

#include<iostream>
#include<bits/stdc++.h>
using namespace std;
int main(){
double b;
string a,a1;
cin>>b>>a>>a1;
int sum=0;
for(int i=0;i<a.size();i+=1){
if(a[i]==a1[i]){
sum+=1;
}
}
if(1.0*sum/a.size()>=b){
cout<<"yes";
}
else{
cout<<"no";
}

}