uestc 1703一道更简单的字符串题目

 1 #include <stdio.h>
 2 #include <string.h>
 3 
 4 char s[1000005];
 5 
 6 unsigned int mha(int st,int len)
 7 {
 8     unsigned int sed = 131;
 9     unsigned int h = 0;
10 
11     for (int i = 0;i < len;i++)
12     {
13         h = h * sed + s[st+i];
14     }
15 
16     return (h & 0x7FFFFFFF);
17 }
18 
19 int main()
20 {
21     scanf("%s",s);
22 
23     int len = strlen(s);
24 
25     int ans;
26 
27     for (int i = 1;i <= len;i++)
28     {
29         bool f = 0;
30 
31         int code = mha(0,i);
32 
33         for (int j = 0;j + i < len;j += i)
34         {
35             int tmp = mha(j,i);
36 
37             if (tmp != code)
38             {
39                 f = 1;
40                 break;
41             }
42         }
43 
44         int re = len % i;
45 
46         code = mha(0,re);
47 
48         int tmp = mha(len-re,re);
49 
50         if (tmp != code) f = 1;
51 
52         if (!f)
53         {
54             ans = i;
55             break;
56         }
57     }
58 
59     printf("%d\n",ans);
60 
61     return 0;
62 }