题解 | #查找两个字符串a,b中的最长公共子串#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNext()) { // 注意 while 处理多个 case
            String a = in.next();
            String b = in.next();
            String c ;
            String d;
            if (a.length() < b.length() ) {
                c = a;
                d = b;
            } else {
                c = b;
                d = a ;
            }
            // if (d.contains(c)) {
            //     System.out.println(c);
            //     continue;
            // }

            fir:
            for (int j = c.length() ; j > 0 ; j --) {
                sec :
                for (int i = 0  ; i <= c.length() - j; i++) {
                    String res = c.substring(i, i + j);
                    if (d.contains(res)) {
                        System.out.println(res);
                        break fir;
                    }

                }


            }


        }
    }
}