#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 1e5 + 5;
ll add[N][26];
ll prv[N][26];
int main(){
ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
string s; cin >> s;
int n = s.length();
ll cnt = 0;
for(int i = 0; i < n; ++i){
int l = i, r = i;
int cur_cnt = 0;
while(l >= 0 && r < n && s[l] == s[r]){
prv[l][s[l] - 'a'] += cur_cnt;
prv[r][s[r] - 'a'] += cur_cnt;
++cur_cnt;
--l; ++r;
}
cnt += cur_cnt;
int lf = l, rg = r;
int cnt_add = 0;
while(l >= 0 && r < n){
--l; ++r;
++cnt_add;
if(s[l] != s[r])break;
}
if(cnt_add){
add[lf][s[rg] - 'a'] += cnt_add;
add[rg][s[lf] - 'a'] += cnt_add;
}
}
for(int i = 1; i < n; ++i){
int l = i - 1, r = i;
int cur_cnt = 0;
while(l >= 0 && r < n && s[l] == s[r]){
++cur_cnt;
prv[l][s[l] - 'a'] += cur_cnt;
prv[r][s[r] - 'a'] += cur_cnt;
--l; ++r;
}
cnt += cur_cnt;
int lf = l, rg = r;
int cnt_add = 0;
while(l >= 0 && r < n){
--l; ++r;
++cnt_add;
if(s[l] != s[r])break;
}
if(cnt_add){
add[lf][s[rg] - 'a'] += cnt_add;
add[rg][s[lf] - 'a'] += cnt_add;
}
}
ll max_add = 0;
for(int i = 0; i < n; ++i){
for(int j = 0; j < 26; ++j){
max_add = max(max_add, add[i][j] - prv[i][s[i] - 'a']);
}
}
cout << cnt + max_add << '\n';
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
106 ms |
2280 KB |
Output is correct |
2 |
Incorrect |
105 ms |
2400 KB |
Output isn't correct |
3 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
40 ms |
41300 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |