题解

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