先用cin 再用getline他会把上一个换行读入

#include<iostream>
#include<string>
using namespace std;

int main()
{

    string s,p;
    double k;
    cin>>k;
    cin.ignore();
    getline(cin,s);
    getline(cin,p);

    double count=0.0;
    for(int i=0;i<s.size();i++)
    {
        if(s[i]==p[i])count=count+1;
    }
    double len=s.size();
    if((count/len)>=k) cout<<"yes"<<endl;
    else cout<<"no"<<endl;
    return 0;
}