#include <bits/stdc++.h>
using namespace std;
#define MAXN 300005
template<int SZ> struct PalTree{
static const int sigma = 26;
int s[SZ], len[SZ], link[SZ], to[SZ][sigma], oc[SZ];
int n, last, sz;
PalTree(){
s[n++] = -1;
link[0] = 1;
len[1] = -1;
sz = 2;
}
int getLink(int v){
while(s[n-len[v]-2] != s[n-1]) v = link[v];
return v;
}
void add(int c){
s[n++] = c;
last = getLink(last);
if(!to[last][c]){
len[sz] = len[last]+2;
link[sz] = to[getLink(link[last])][c];
to[last][c] = sz++;
}
last = to[last][c];
oc[last]++;
}
void prop(){
vector<pair<int, int>> v;
for(int i = 2; i<sz; i++) v.push_back({len[i], i});
sort(v.begin(), v.end()); reverse(v.begin(), v.end());
for(auto a : v) oc[link[a.second]] += oc[a.second];
}
};
PalTree<MAXN> tree;
string s;
int main(){
// freopen("a.in", "r", stdin);
ios_base::sync_with_stdio(false);
cin.tie(0);
cin >> s;
for(int i = 0; i<s.length(); i++){
tree.add(s[i]-'a');
}
tree.prop();
long long ans = 0;
for(int i = 2; i<tree.sz; i++){
ans = max(ans, 1ll*tree.len[i]*tree.oc[i]);
}
cout << ans << endl;
}
Compilation message
palindrome.cpp: In function 'int main()':
palindrome.cpp:46:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
46 | for(int i = 0; i<s.length(); i++){
| ~^~~~~~~~~~~
palindrome.cpp: In constructor 'PalTree<SZ>::PalTree() [with int SZ = 300005]':
palindrome.cpp:10:11: warning: '*<unknown>.PalTree<300005>::n' is used uninitialized in this function [-Wuninitialized]
10 | s[n++] = -1;
| ^
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
364 KB |
Output is correct |
| 2 |
Correct |
1 ms |
364 KB |
Output is correct |
| 3 |
Correct |
1 ms |
364 KB |
Output is correct |
| 4 |
Correct |
1 ms |
364 KB |
Output is correct |
| 5 |
Correct |
1 ms |
364 KB |
Output is correct |
| 6 |
Correct |
1 ms |
364 KB |
Output is correct |
| 7 |
Correct |
1 ms |
364 KB |
Output is correct |
| 8 |
Correct |
1 ms |
384 KB |
Output is correct |
| 9 |
Correct |
1 ms |
364 KB |
Output is correct |
| 10 |
Correct |
1 ms |
364 KB |
Output is correct |
| 11 |
Correct |
1 ms |
364 KB |
Output is correct |
| 12 |
Correct |
1 ms |
364 KB |
Output is correct |
| 13 |
Correct |
1 ms |
364 KB |
Output is correct |
| 14 |
Correct |
1 ms |
512 KB |
Output is correct |
| 15 |
Correct |
1 ms |
364 KB |
Output is correct |
| 16 |
Correct |
1 ms |
384 KB |
Output is correct |
| 17 |
Correct |
1 ms |
364 KB |
Output is correct |
| 18 |
Correct |
1 ms |
364 KB |
Output is correct |
| 19 |
Correct |
1 ms |
364 KB |
Output is correct |
| 20 |
Correct |
1 ms |
364 KB |
Output is correct |
| 21 |
Correct |
1 ms |
364 KB |
Output is correct |
| 22 |
Correct |
1 ms |
364 KB |
Output is correct |
| 23 |
Correct |
1 ms |
364 KB |
Output is correct |
| 24 |
Correct |
1 ms |
492 KB |
Output is correct |
| 25 |
Correct |
1 ms |
364 KB |
Output is correct |
| 26 |
Correct |
1 ms |
364 KB |
Output is correct |
| 27 |
Correct |
1 ms |
364 KB |
Output is correct |
| 28 |
Correct |
1 ms |
364 KB |
Output is correct |
| 29 |
Correct |
1 ms |
364 KB |
Output is correct |
| 30 |
Correct |
1 ms |
364 KB |
Output is correct |
| 31 |
Correct |
1 ms |
364 KB |
Output is correct |
| 32 |
Correct |
1 ms |
364 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
492 KB |
Output is correct |
| 2 |
Correct |
1 ms |
492 KB |
Output is correct |
| 3 |
Correct |
1 ms |
492 KB |
Output is correct |
| 4 |
Correct |
1 ms |
492 KB |
Output is correct |
| 5 |
Correct |
1 ms |
492 KB |
Output is correct |
| 6 |
Correct |
1 ms |
492 KB |
Output is correct |
| 7 |
Correct |
1 ms |
492 KB |
Output is correct |
| 8 |
Correct |
1 ms |
492 KB |
Output is correct |
| 9 |
Correct |
1 ms |
492 KB |
Output is correct |
| 10 |
Correct |
1 ms |
364 KB |
Output is correct |
| 11 |
Correct |
1 ms |
364 KB |
Output is correct |
| 12 |
Correct |
1 ms |
492 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
1772 KB |
Output is correct |
| 2 |
Correct |
2 ms |
1772 KB |
Output is correct |
| 3 |
Correct |
2 ms |
1772 KB |
Output is correct |
| 4 |
Correct |
2 ms |
1772 KB |
Output is correct |
| 5 |
Correct |
2 ms |
1772 KB |
Output is correct |
| 6 |
Correct |
3 ms |
1772 KB |
Output is correct |
| 7 |
Correct |
3 ms |
1772 KB |
Output is correct |
| 8 |
Correct |
1 ms |
492 KB |
Output is correct |
| 9 |
Correct |
1 ms |
492 KB |
Output is correct |
| 10 |
Correct |
2 ms |
1388 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
13 ms |
13608 KB |
Output is correct |
| 2 |
Correct |
20 ms |
13608 KB |
Output is correct |
| 3 |
Correct |
18 ms |
13608 KB |
Output is correct |
| 4 |
Correct |
19 ms |
13608 KB |
Output is correct |
| 5 |
Correct |
20 ms |
13608 KB |
Output is correct |
| 6 |
Correct |
14 ms |
10536 KB |
Output is correct |
| 7 |
Correct |
17 ms |
11944 KB |
Output is correct |
| 8 |
Correct |
3 ms |
1132 KB |
Output is correct |
| 9 |
Correct |
5 ms |
4076 KB |
Output is correct |
| 10 |
Correct |
18 ms |
11816 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
49 ms |
40552 KB |
Output is correct |
| 2 |
Correct |
57 ms |
40552 KB |
Output is correct |
| 3 |
Correct |
41 ms |
40552 KB |
Output is correct |
| 4 |
Correct |
59 ms |
40552 KB |
Output is correct |
| 5 |
Correct |
57 ms |
40552 KB |
Output is correct |
| 6 |
Correct |
52 ms |
36712 KB |
Output is correct |
| 7 |
Correct |
48 ms |
32768 KB |
Output is correct |
| 8 |
Correct |
6 ms |
2420 KB |
Output is correct |
| 9 |
Correct |
6 ms |
2420 KB |
Output is correct |
| 10 |
Correct |
46 ms |
32376 KB |
Output is correct |
| 11 |
Correct |
42 ms |
40552 KB |
Output is correct |
| 12 |
Correct |
9 ms |
5876 KB |
Output is correct |
