基因相关性

#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
#include <algorithm>
using namespace std;
int main()
{
int lena,i,sum=0;
double x;
char sa[505],sb[505];
cin>>x;
gets(sa);gets(sa);
gets(sb);
lena=strlen(sa);
for (i=0;i<lena;i++)
if (sa[i]==sb[i])sum++;
if (1.0*sum/lena>=x)
cout<<"yes"<<endl;
else cout<<"no"<<endl;
return 0;
}