이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <algorithm>
#include <vector>
#include <cstdio>
#include <cstring>
#include <iostream>
#define PB push_back
using namespace std;
typedef long long ll;
const int N = 3e5 + 500;
const int INF = 0x3f3f3f3f;
struct node{
node *ch[30], *bk;
int len, cnt;
node() {}
node(int _len) { len = _len; }
};
bool cmp(node* X, node* Y){
return X->len > Y->len;
}
string s;
int n;
ll mx;
vector < node* > v;
void precompute(){
node *n1 = new node();
node *n0 = new node();
n1->len = -1, n0->len = 0;
n0->bk = n1; n1->bk = n1;
node* cur = n0;
for(int i = 0;i < n;i++){
for(; cur->len + 1 > i || s[i - cur->len - 1] != s[i]; cur = cur->bk);
node *rmb = cur->bk;
if(cur->ch[s[i] - 'a'] == NULL)
cur->ch[s[i] - 'a'] = new node(), v.PB(cur->ch[s[i] - 'a']);
cur->ch[s[i] - 'a']->len = cur->len + 2;
cur = cur->ch[s[i] - 'a'];
cur->cnt++;
for(; rmb->len + 1 > i || s[i - rmb->len - 1] != s[i]; rmb = rmb->bk);
if(cur->len == 1)
cur->bk = n0;
else{
if(rmb->ch[s[i] - 'a'] == NULL)
rmb->ch[s[i] - 'a'] = new node(), v.PB(rmb->ch[s[i] - 'a']);
cur->bk = rmb->ch[s[i] - 'a'];
}
}
}
int main(){
cin >> s;
n = (int)s.size();
precompute();
sort(v.begin(), v.end(), cmp);
for(int i = 0;i < v.size();i++){
mx = max(mx, (ll)v[i]->len * v[i]->cnt);
v[i]->bk->cnt += v[i]->cnt;
}
cout << mx << endl;
}
컴파일 시 표준 에러 (stderr) 메시지
palindrome.cpp: In function 'int main()':
palindrome.cpp:64:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<node*>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
64 | for(int i = 0;i < v.size();i++){
| ~~^~~~~~~~~~
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