题解 | #公共子串计算#

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {


    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String s1 = br.readLine();
        String s2 = br.readLine();

        int maxStr = 0;
        int[][] dp = new int[s1.length()+1][s2.length()+2];
        for (int i = 1; i <= s1.length(); i++) {
            for (int j = 1; j <= s2.length(); j++) {
                if (s1.charAt(i-1) == s2.charAt(j-1)){
                    dp[i][j] = dp[i-1][j-1] + 1;
                    if (maxStr < dp[i][j]) maxStr = dp[i][j];
                }
            }
        }
        System.out.println(maxStr);
    }
}