学步园

题目链接：uva 12012 - Detection of Extraterrestrial

题目大意:给定一个字符串，问说子串中，循环次数为k个最大长度为多少。

解题思路：枚举起点位置，然后用KMP处理。

#include <cstdio>
#include <cstring>
#include <algorithm>

using namespace std;
const int maxn = 1005;

int jump[maxn], c[maxn];

void get_jump (char* s, int n) {
    int p = 0;
    jump[0] = jump[1] = 0;
    for (int i = 2; i <= n; i++) {
        while (p && s[p+1] != s[i])
            p = jump[p];

        if (s[p+1] == s[i])
            p++;

        jump[i] = p;
    }
}

int main () {
    int cas;
    char s[maxn];
    scanf("%d", &cas);

    for (int kcas = 1; kcas <= cas; kcas++) {
        scanf("%s", s+1);

        int n = strlen(s+1);
        memset(c, 0, sizeof(c));

        for (int t = 0; t < n; t++) {
            int m = n - t;
            get_jump(s + t, m);

            for (int j = 1; j <= m; j++) {
                int p = j;
                while (p) {

                    p = jump[p];
                    if (j % (j - p) == 0) {
                        int k = j / (j - p);
                        c[k] = max(c[k], j);
                    }
                }
            }
        }

        printf("Case #%d:", kcas);
        for (int i = 1; i <= n; i++)
            printf(" %d", c[i]);
        printf("\n");
    }
    return 0;
}