Submission #1128027

#	Time	Username	Problem	Language	Result	Execution time	Memory
1128027		Agageldi	Hacker (BOI15_hac)	C++20	100 / 100	280 ms	22100 KiB

hac

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define N 4000005
#define ff first
#define ss second
#define pb push_back
#define sz(s) (int)s.size()
#define rep(c, a, b) for(c = a; c <= b; c++)

ll n, v[N], mx, sum, answer, k, l;
multiset <ll> s;
deque <ll> d;

int main () {
	ios::sync_with_stdio(0);cin.tie(0);
	cin >> n;
	k = (n+1)/2;
	for(int i = 1; i <= n; i++) {
		cin >> v[i];
		if(i <= k) sum += v[i];
	}
	for(int i = 1; i <= n; i++) {
		v[i + n] = v[i];
	}
	l = 1;
	s.insert(sum);
	d.pb(sum);
	for(int i = k + 1; i <= 2*n; i++) {
		sum -= v[l];
		sum += v[i];
		d.pb(sum);
		s.insert(sum);
		if(sz(s) == k) {
			mx = max(mx,(*s.begin()));
			s.erase(s.find(d[0]));
			d.pop_front();
		}
		l++;
	}
	cout << mx << '\n';
}

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 40 / 40