uva10298 Power Strings

这题就是求一个字符串的最小循环节长度，然后ans = len / k；

if (len % (len - nxt[len]) == 0) ans = len / (len - nxt[len]);

else ans = 1;

const int maxn = 1e6 + 10;
char s[maxn];
int nxt[maxn];
void get_nxt() {
int i = 0, j = -1;
nxt[0] = -1;
int len = strlen(s);
while(i < len) {
while(j != -1 && s[i] != s[j]) j = nxt[j];
nxt[++i] = ++j;
}
}
int main(int argc, const char * argv[])
{
// freopen("in.txt","r",stdin);
// freopen("out.txt","w",stdout);
// clock_t _ = clock();

while(scanf("%s", s) != EOF) {
if (s[0] == '.') break;
get_nxt();
int len = strlen(s);
if (len % (len - nxt[len]) == 0) cout << len / (len - nxt[len]) << endl;
else cout << 1 << endl;
}

// printf("\nTime cost: %.2fs\n", 1.0 * (clock() - _) / CLOCKS_PER_SEC);
return 0;
}