题解

#include <bits/stdc++.h>
using namespace std;
int main(){
    double a;
    string s1,s2;
    cin>>a;
    cin>>s1>>s2;
    double ans1=min(s1.size(),s2.size());
    double ans2=0;
    for(int i=0;i<min(s1.size(),s2.size());i++)
    	if(s1[i]==s2[i]) ans2++;
    if(ans2/ans1>a) cout<<"yes"<<endl;
    else cout<<"no"<<endl;
    return 0;
}