1 #include <stdio.h>
 2 #include <string.h>
 3 char s1[50050],s2[50050];
 4 int next[50050];
 5 void getnext()
 6 {
 7     int i = 0,j = -1;
 8     next[0] = -1;
 9     int len = strlen(s1);
10     while (i < len)
11     {
12         if (j == -1 || s1[i] == s1[j])
13         {
14             i ++;
15             j ++;
16             if (s1[i] == s1[j])
17                 next[i] = next[j];
18             else
19                 next[i] = j;
20         }
21         else
22             j = next[j];
23     }
24 }
25 int kmp()
26 {
27     int i = 0,j = 0;
28     int len1 = strlen(s1);
29     int len2 = strlen(s2);
30     while (i < len2)  //特别注意 跟模板有少许的差别
31     {
32         if (j == -1 || s1[j] == s2[i])
33         {
34             i ++;
35             j ++;
36         }
37         else
38             j = next[j];
39     }
40     return j;
41 }
42 int main()
43 {
44     while (~scanf("%s",s1))
45     {
46         scanf("%s",s2);
47         getnext();
48         int len = kmp();
49         
50         for (int i = 0; i < len; i ++)
51             printf("%c",s1[i]);
52         if (len)
53             printf(" ");
54         printf("%d\n",len);
55     }
56     return 0;
57 }