Java 代码

import java.util.Scanner;

public class Main
{
    public static void main(String[] args)
    {
        Scanner cin = new Scanner(System.in);

        double r = cin.nextDouble();
        String a = cin.next();
        String b = cin.next();

        int count = 0;
        for (int i = 0; i < a.length(); i ++)
        {
            if (a.charAt(i) == b.charAt(i))
                count += 1;
        }

        if (count * 1.0/ a.length() >= r)
            System.out.println ("yes");
        else
            System.out.println ("no");
    }
}