Submission #1126726

#	Time	Username	Problem	Language	Result	Execution time	Memory
1126726		ssitaram	Hacker (BOI15_hac)	C++20	100 / 100	376 ms	13924 KiB

hac

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

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int n; cin >> n;
	int len = (n + 1) / 2;
	vector<int> a(n);
	for (int& i : a) cin >> i;
	partial_sum(a.begin(), a.end(), a.begin());
	auto at = [&](int i) -> int {
		i = (i % n + n) % n;
		int e = (i + len - 1) % n;
		if (i <= e) {
			return a[e] - (i == 0 ? 0 : a[i - 1]);
		}
		return a[n - 1] - a[i - 1] + a[e];
	};
	multiset<int> ms;
	for (int i = -len; i < 0; ++i) ms.insert(at(i));
	int ans = -1;
	for (int i = 0; i < n; ++i) {
		ms.erase(ms.find(at(i - len)));
		ms.insert(at(i));
		ans = max(ans, *ms.begin());
	}
	cout << ans << '\n';
	return 0;
}

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