题解 | #公共子串计算#

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String s1 = in.next();
        String s2 = in.next();
        boolean flag = s1.length()<=s2.length();
        String str1;
        String str2;
        if(flag){
            str1 = s1;
            str2 = s2;
        }else{
            str1 = s2;
            str2 = s1;
        }
        outer:
        for(int i = str1.length(); i>0; i--){
            for(int j = 0; j<str1.length(); j++){
                if(j+i<=str1.length()){
                    if(str2.contains(str1.substring(j,j+i))){
                        System.out.print(i);
                        flag = false;
                        break outer;
                    }
                }
            }
        }
        if(flag){
            System.out.print(0);
        }
    }
}