poj 2406 Power Strings

#include<iostream>
#include<cstdio>
#include<cstring>
#define maxn 10000010
using namespace std;
int l,nxt[maxn];
char s[maxn];
void getnxt(){
    int i=0,j=-1;
    nxt[0]=-1;
    while(i!=l){
        if(s[i]==s[j]||j==-1)nxt[++i]=++j;
        else j=nxt[j];
    }
}
int main(){
    while(1){
        scanf("%s",s);
        l=strlen(s);if(l==1&&s[0]==‘.‘)return 0;
        getnxt();
        int ans=1;
        if(l%(l-nxt[l])==0)ans=l/(l-nxt[l]);
        printf("%d\n",ans);
    }
}