#include <stdio.h>
#include <string.h>

#define N 256
int f(const char *s1, const char *s2)
{
    int a[N][N];
    int len1 = strlen(s1);
    int len2 = strlen(s2);
    int i, j;

    memset(a, 0, sizeof(int) * N * N);
    int max = 0;
    for (i = 1; i <= len1; i++)
    {
        for (j = 1; j <= len2; j++)
        {
            if (s1[i - 1] == s2[j - 1])
            {
                a[i][j] = a[i - 1][j - 1] + 1; //填空
                if (a[i][j] > max)
                    max = a[i][j];
            }
        }
    }
    return max;
}

int main()
{
    printf("%d\n", f("abcdkkk", "baabcdadabc"));
    return 0;
}
