最大公共子串

public class Main {
    static int f(String s1, String s2) {
        char[] c1 = s1.toCharArray();
        char[] c2 = s2.toCharArray();

        int[][] a = new int[c1.length + 1][c2.length + 1];

        int max = 0;
        for (int i = 1; i < a.length; i++) {
            for (int j = 1; j < a[i].length; j++) {
                if (c1[i - 1] == c2[j - 1]) {
                    a[i][j] =  a[i-1][j-1] + 1;  //填空 
                    if (a[i][j] > max) max = a[i][j];
                }
            }
        }

        return max;
    }

    public static void main(String[] args) {
        int n = f("abcdkkk", "baabcdadabc");
        System.out.println(n);
    }
}