The little cat is so famous, that many couples tramp over hill and dale to Byteland, and asked the little cat to give names to their newly-born babies. They seek the name, and at the same time seek the fame. In order to escape from such boring job, the innovative little cat works out an easy but fantastic algorithm:

Step1. Connect the father‘s name and the mother‘s name, to a new string S.
Step2. Find a proper prefix-suffix string of S (which is not only the prefix, but also the suffix of S).

Example: Father=‘ala‘, Mother=‘la‘, we have S = ‘ala‘+‘la‘ = ‘alala‘. Potential prefix-suffix strings of S are {‘a‘, ‘ala‘, ‘alala‘}. Given the string S, could you help the little cat to write a program to calculate the length of possible prefix-suffix strings of S? (He might thank you by giving your baby a name:)

The input contains a number of test cases. Each test case occupies a single line that contains the string S described above.

Restrictions: Only lowercase letters may appear in the input. 1 <= Length of S <= 400000.

For each test case, output a single line with integer numbers in increasing order, denoting the possible length of the new baby‘s name.

ababcababababcabab
aaaaa

2 4 9 18
1 2 3 4 5

KMP模板题。

 1 #include <iostream>
 2 #include <stdio.h>
 3 #include <string.h>
 4 using namespace std;
 5 char str[400010];
 6 int nex[400010];
 7 int a[400010];
 8 void init(){
 9     int j = nex[0] = -1, i = 0;
10     int len = strlen(str);
11     while(i < len){
12         if(j == -1 || str[i] == str[j]) nex[++i] = ++j;
13         else j = nex[j];
14     }
15 }
16 int main(){
17     while(scanf("%s",str)!=EOF){
18         init();
19         int k = 0,len = strlen(str);
20         int i = len;
21         while(nex[i]){
22             a[k++] = nex[i];
23             i = nex[i];
24         }
25         for(int i = k-1; i >= 0; i --){
26             printf("%d ",a[i]);
27         }
28         printf("%d\n",len);
29     }
30     return 0;
31 }

 1 #include <iostream>
 2 #include <stdio.h>
 3 #include <string.h>
 4 #include <algorithm>
 5 #include <string>
 6 #include <queue>
 7 #include <vector>
 8 #include <set>
 9 #include <map>
10 #define ll long long
11 #define INF 0x3f3f3f3f
12 #define lowvit(x) x&(-x)
13 #define N 50010
14 #define M 210
15 using namespace std;
16 char str[M];
17 struct Nod {
18     int num;
19     Nod * next[11];
20     Nod(){
21         for(int i = 0; i < 10; i ++)
22             next[i] = NULL;
23         num = 0;
24     }
25 };
26 int len;
27 void mkTree(Nod *p,char *str) {
28     for(int i = 0; i < len; i ++) {
29         int x = str[i] - ‘0‘;
30         if(p->next[x] == NULL) {
31             p->next[x] = new Nod;
32         }
33         p = p->next[x];
34         p->num++;
35     }
36 }
37 int MAX = -1;
38 void dfs(Nod *p, int x) {
39     for(int i = 0; i < 10; i ++) {
40         if(p->next[i] != NULL) {
41             Nod *p1 = p->next[i];
42             int ans = p1->num;
43             if(MAX < ans*(x+1)) {
44                 MAX = ans*(x+1);
45                 // printf("%d %d \n",ans,(x+1));
46             }
47             dfs(p1,x+1);
48         }
49     }
50     return ;
51 }
52 
53 int main() {
54     ios::sync_with_stdio(false);
55     int t, n;
56     cin>>t;
57     while(t--) {
58         Nod *root = new Nod;
59         cin>>n;
60         for(int i = 0; i < n; i ++) {
61             cin>>str;
62             len = strlen(str);
63             mkTree(root,str);
64         }
65         MAX = 0;
66         dfs(root, 0);
67         printf("%d\n",MAX);
68     }
69     return 0;
70 }