题解 | #公共子串计算#

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.hasNextInt()) { // 注意 while 处理多个 case
        //     int a = in.nextInt();
        //     int b = in.nextInt();
        //     System.out.println(a + b);
        // }
        String s1 = in.nextLine();
        String s2 = in.nextLine();
        int len1 = s1.length();
        int len2 = s2.length();
        int[][] dp = new int[len1 + 1][len2 + 1];
        int max = 0;
        for (int i = 1; i <= len1; i++) {
            for (int j = 1; j <= len2; j++) {
                if (s1.charAt(i - 1) == s2.charAt(j - 1)) {
                    dp[i][j] = dp[i - 1][j - 1] + 1;
                }
                max = Math.max(max, dp[i][j]);
            }
        }
        System.out.print(max);
    }
}