Java 代码

import java.util.Scanner;
import java.util.StringTokenizer;

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

        StringTokenizer st = new StringTokenizer(cin.nextLine(), ",");
        String s = st.nextToken();
        String s1 = st.nextToken();
        String s2 = st.nextToken();

        int len = s.length();
        int len1 = s1.length();
        int len2 = s2.length();

        if (len < len1 || len < len2)
            System.out.println (-1);
        else
        {
            int l = -1;
            for (int i = 0; i <= len - len1; i++)
            {
                if (s.substring(i, i+len1).compareTo(s1) == 0)
                {
                    l = i + len1;
                    break;
                }
            }

            int r = -1;
            for (int j = len - len2; j >=0 ; j -- )
            {
                if (s.substring(j, j+len2).compareTo(s2) == 0)
                {
                    r = j;
                    break;
                }
            }

            if (l > -1 && r > -1 && r > l)
                System.out.println (r - l);
            else
                System.out.println (-1);
        }
    }
}