hdoj 3746 Cyclic Nacklace

 1 #include <stdio.h>
 2 #include <string.h>
 3 #include <stdlib.h>
 4 #define MAX 100010
 5 char str1[MAX];
 6 int next[MAX];
 7 void getnext(char b[MAX],int m)
 8 {
 9    int i=0,j=-1;
10    next[i]=-1;
11    while(i<m)
12    {
13       if(j==-1||b[j]==b[i])
14       {i++;
15        j++;
16        next[i]=j;
17         }
18       else
19         j=next[j];
20     }
21 }
22 int main()
23 {
24     int len,t;
25     int l;
26     scanf("%d",&t);
27     while(t--)
28     {
29        memset(next,0,sizeof(next));
30         scanf("%s",str1);
31         len=strlen(str1);
32         getnext(str1,len);
33         l=len-next[len];
34         if(len==l)
35                 printf("%d\n",len);
36         else
37            { if(len%l==0)
38                 printf("0\n");
39              else
40                 printf("%d\n",l-len%l);
41            }
42     }
43        return 0;
44 }

 1     #include<iostream>
 2     #include<cstring>
 3     #include<cstdio>
 4     #include<algorithm>
 5     using namespace std;
 6     #define N 100010
 7 
 8     char s[N];
 9     int nextval[N];
10     int len;
11 
12     void getnext(const char *s)
13     {
14         int i = 0, j = -1;
15         nextval[0] = -1;
16         while(i != len)
17         {
18             if(j == -1 || s[i] == s[j])
19                 nextval[++i] = ++j;
20             else
21                 j = nextval[j];
22         }
23     }
24 
25     int main()
26     {
27         int ncase;
28         int length, add;
29         scanf("%d", &ncase);
30         while(ncase--)
31         {
32             scanf("%s", s);
33             len = strlen(s);
34             getnext(s);
35             for(int i = 0; i <= len; ++i) //查看next数组的内容
36             cout<<nextval[i]<<" ";
37             cout<<endl;
38             length = len - nextval[len]; //循环节的长度
39             if(len != length && len % length == 0) //循环多次
40                 printf("0\n");
41             else
42             {
43                 add = length - nextval[len] % length; //取余的作用：abcab，去掉abc
44                 printf("%d\n",add);
45             }
46         }
47         return 0;
48     }