题解

#include <bits/stdc++.h>
using namespace std;
string s1,s2;
int cnt=0;
int main()
{
	double t;
	cin>>t;
	cin>>s1>>s2;
	int len=s1.size();
	for(int i=0;i<=len-1;i++)
	{
		if(s1[i]==s2[i]) cnt++;
		
	 } 
	 if(t<=(cnt*1.0/len)) cout<<"yes";
	 else cout<<"no";
	return 0;
}