xtu字符串 B. Power Strings

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <cstring>
 4 #include <cstdlib>
 5 #include <vector>
 6 #include <climits>
 7 #include <algorithm>
 8 #include <cmath>
 9 #define LL long long
10 #define INF 0x3f3f3f
11 using namespace std;
12 const int maxn = 1000100;
13 char str[maxn];
14 int fail[maxn];
15 void getFail(int &len) {
16     int i,j;
17     len = strlen(str);
18     fail[0] = fail[1];
19     for(i = 1; i < len; i++) {
20         j = fail[i];
21         while(j && str[j] != str[i]) j = fail[j];
22         fail[i+1] = str[j] == str[i] ? j+1:0;
23     }
24 }
25 int main() {
26     int len;
27     while(gets(str) && str[0] != ‘.‘) {
28         getFail(len);
29         if(len%(len-fail[len])) puts("1");
30         else printf("%d\n",len/(len-fail[len]));
31     }
32     return 0;
33 }