POJ - 2406 Power Strings

 1 #include<stdio.h>
 2 #include<string.h>
 3 const int maxn=1000000;
 4 char s[maxn];
 5 int next[maxn];
 6 void get_next(int len)
 7 {
 8     int i=0,j=-1;
 9     next[0]=-1;
10     while(i<len){
11         if(j==-1 || s[i]==s[j])
12             next[++i]=++j;
13         else
14             j=next[j];
15     }
16 }
17 int main()
18 {
19     while(scanf("%s",s)!=EOF){
20         if(s[0]==‘.‘)
21             break;
22         int len=strlen(s);
23         get_next(len);
24         int modans=len%(len-next[len]);
25         if(modans)
26             printf("1\n");
27         else
28             printf("%d\n",len/(len-next[len]));
29     }
30     return 0;
31 }