Submission #888266

#	Time	Username	Problem	Language	Result	Execution time	Memory
888266		beaboss	Hacker (BOI15_hac)	C++14	100 / 100	232 ms	18512 KiB

hac

// Source: https://oj.uz/problem/view/BOI15_hac
// 

#include "bits/stdc++.h"

using namespace std;

#define s second
#define f first
#define pb push_back

typedef long long ll;

typedef pair<int, int> pii;
typedef vector<pii> vpii;

typedef vector<int> vi;

#define FOR(i, a, b) for (int i = (a); i<b; i++)

bool ckmin(int& a, int b){ return b < a ? a = b, true : false; }

bool ckmax(int& a, int b){ return b > a ? a = b, true : false; }

const int N = 5e5 + 10;
int a[N];
int res[N];

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	int n;
	cin >> n;

	FOR(i, 0, n) cin >> a[i];

	int sum = 0;

	FOR(i, 0, (n+1)/2) sum += a[i];

	int i = 0;
	int j = (n+1)/2;

	for (;i < n;) {
		res[i] = sum;
		sum += a[j]-a[i];
		i++;
		j = (j + 1) % n;
	}

	multiset<int> window;

	FOR(i, 0, (n + 1) / 2) window.insert(res[i]);

	int ans = 0;

	i = 0;
	j = (n+1)/2;

	for (;i < n;) {
		ans = max(ans, *window.begin());
		window.erase(window.find(res[i]));
		window.insert(res[j]);

		i++;
		j = (j + 1) % n;
	}
	cout << ans << endl;

}

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