Ural 1960 Palindromes and Super Abilities

 1 #include <bits/stdc++.h>
 2 using namespace std;
 3 const int maxn = 100010;
 4 struct PalindromicTree{
 5     int fail[maxn],len[maxn],son[maxn][26];
 6     int tot,last,n;
 7     char s[maxn];
 8     int newnode(int slen = 0){
 9         memset(son[tot],0,sizeof son[tot]);
10         len[tot] = slen;
11         return tot++;
12     }
13     void init(){
14         n = tot = last = 0;
15         newnode(0);
16         newnode(-1);
17         fail[1] = fail[0] = 1;
18         s[n] = -1;
19     }
20     int getFail(int x){
21         while(s[n - len[x] - 1] != s[n]) x = fail[x];
22         return x;
23     }
24     void extend(int c){
25         s[++n] = c;
26         int cur = getFail(last);
27         if(!son[cur][c]){
28             int x = newnode(len[cur] + 2);
29             fail[x] = son[getFail(fail[cur])][c];
30             son[cur][c] = x;
31         }
32         last = son[cur][c];
33     }
34 }pt;
35 char str[maxn];
36 int main(){
37     while(~scanf("%s",str)){
38         pt.init();
39         bool flag = false;
40         for(int i = 0; str[i]; ++i){
41             pt.extend(str[i] - ‘a‘);
42             if(flag) putchar(‘ ‘);
43             printf("%d",pt.tot - 2);
44             flag = true;
45         }
46         putchar(‘\n‘);
47     }
48     return 0;
49 }