제출 #990901

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
990901		ToniB	Bigger segments (IZhO19_segments)	C++17	37 / 100	1555 ms	9160 KiB

segments

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

#define X first
#define Y second

typedef long long ll;
typedef pair<int, ll> pii;

const int N = 5e5 + 2;

int n, a[N];
pii dp[N][2];
ll pre[N];

ll sum(int i, int j) {
	if (i) return pre[j] - pre[i - 1];
	return pre[j];
}
bool cmp(pii x, pii y) {
	if (x.X == y.X) return x.Y < y.Y;
	return x.X > y.X;
}

int main(){
	cin >> n;
	for (int i = 0; i < n; ++i) cin >> a[i];
	
	pre[0] = a[0];
	for (int i = 1; i < n; ++i) pre[i] = a[i] + pre[i - 1];
	
	dp[0][0] = dp[0][1] = {1, a[0]};

	for (int i = 1; i < n; ++i) {
		vector<pii> v = {{1, pre[i]}};
		for (int j = 0; j < i; ++j) {
			for (int k = 0; k < 2; ++k) {
				if (sum(j + 1, i) >= dp[j][k].Y) {
					v.push_back({dp[j][k].X + 1, sum(j + 1, i)});
				}
			}
		}
		sort(v.begin(), v.end(), cmp);
		dp[i][0] = v[0];
		dp[i][1] = v[0];
		for (int j = 1; j < (int)v.size(); ++j) {
			if (v[j].X != v[0].X) {
				dp[i][1] = v[j];
				break;
			}
		}
	}

	cout << dp[n - 1][0].X << "\n";
	
	return 0;
}

• Subtask 1: 13 / 13
• Subtask 2: 14 / 14
• Subtask 3: 10 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27