题解 | #公共子串计算#双指针法

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);
        String s = in.nextLine();
        String s1 = in.nextLine();
        int result = 0;
        for (int i = 0; i < s.length(); i++) {
            String subStr = s.substring(i);
            int j = 0;
            int k = 0;
            int l = 0;
            while (j < subStr.length() && k < s1.length()) {
                if (subStr.charAt(j) == s1.charAt(k)) {
                    j++;
                    k++;
                    l++;
                    result = Math.max(result, l);
                } else {
                    j = j - l;
                    k = k - l + 1;
                    l = 0;
                }
            }
        }
        System.out.println(result);
    }
}