poj1961--Power Strings(kmp:求循环串的次数)

#include <cstdio>
#include <cstring>
#include <algorithm>
int next[1100000] ;
char str[1100000] ;
void getnext(int l)
{
    int j = 0 , k = -1 ;
    next[0] = -1 ;
    while(j < l)
    {
        if( k == -1 || str[j] == str[k] )
        {
            j++ ;
            k++ ;
            next[j] = k ;
        }
        else
            k = next[k] ;
    }
}
int main()
{
    int l , m ;
    while(scanf("%s", str)!=EOF)
    {
        if( str[0] == '.' ) break;
        l = strlen(str);
        getnext(l) ;
        m = next[l];
        if( m == -1  )
            printf("1\n");
        else if(m == l)
            printf("%d\n", l);
        else if( l % (l-m) != 0 )
            printf("1\n");
        else
        {
            m = l / ( l-m );
            printf("%d\n", m);
        }
        memset(str,0,sizeof(str));
    }
    return 0;
}