Submission #1162268

#	Time	Username	Problem	Language	Result	Execution time	Memory
1162268		Pwo	Real Mountains (CCO23_day1problem2)	C++20	0 / 25	0 ms	324 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define int long long
const int md = 1e6 + 3;

int n, a[5005], b[5005];
vector<pair<int, int>> v;
vector<pair<int, int>> op[5005];
 
int32_t main() {
	ios::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
	cin >> n; for (int i = 1; i <= n; i++) cin >> a[i];
	for (int i = 1; i <= n; i++) v.emplace_back(a[i], i);
	sort(v.begin(), v.end(), greater<pair<int, int>>());
	int j = 0, c = v[0].first;
	fill(b, b + n + 1, 1e9);
	
	while (j < n) {
		vector<int> idx;
		while (v[j].first == c) {
			idx.push_back(v[j].second);
			j++;
		}
		if (idx.size() > 1) {
			int s = idx.back(), e = idx[0];
			for (int i = s + 1; i < e; i++)
				if (b[i] == 1e9) op[i].emplace_back(c, c);
		}
		int acc = 1e9;
		for (int i = 1; i < idx.back(); i++) {
			if (acc != 1e9 && b[i] == 1e9) op[i].emplace_back(acc, c);
			acc = min(acc, b[i]);
		}
		acc = 1e9;
		for (int i = n - 1; i > idx[0]; i--) {
			if (acc != 1e9 && b[i] == 1e9) op[i].emplace_back(acc, c);
			acc = min(acc, b[i]);
		}
		for (const int u : idx) b[u] = c;
		if (j >= n) break;
		c = v[j].first;
	}
	
	int ans = 0;
	for (int i = 1; i <= n; i++) {
		reverse(op[i].begin(), op[i].end());
		for (const auto p : op[i]) {
			int m = min(p.first, p.second);
			int d = m - a[i]; 
			ans += d * (p.first + p.second);
			ans += d * (a[i] + m) / 2;
			ans %= md;
		}
	}
	cout << ans;
}

• Subtask 1: 0 / 3
• Subtask 2: 0 / 3
• Subtask 3: 0 / 3
• Subtask 4: 0 / 3
• Subtask 5: 0 / 4
• Subtask 6: 0 / 5
• Subtask 7: 0 / 4