Submission #1091572

#	Time	Username	Problem	Language	Result	Execution time	Memory
1091572		stdfloat	Global Warming (CEOI18_glo)	C++17	100 / 100	49 ms	4412 KiB

glo

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

using ll = long long;

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

	int n, x;
	cin >> n >> x;

	vector<int> a(n);
	for (auto &i : a)
		cin >> i;

	deque<int> v;
	vector<int> u(n);
	for (int i = n - 1; i >= 0; i--) {
		if (v.empty() || v[0] > a[i]) {
			v.push_front(a[i]);
			u[i] = (int)v.size();
		}
		else {
			int t = upper_bound(v.begin(), v.end(), a[i]) - v.begin() - 1;
			u[i] = (int)v.size() - t; v[t] = a[i];
		}
	}

	v.clear();
	int ans = u[0];
	for (int i = 0; i < n; i++) {
		if (v.empty() || v.back() < a[i]) {
			ans = max(ans, (int)v.size() + u[i]);
			v.push_back(a[i]);
		}
		else {
			ans = max(ans, (int)(lower_bound(v.begin(), v.end(), a[i] + x) - v.begin()) + u[i]);
			v[lower_bound(v.begin(), v.end(), a[i]) - v.begin()] = a[i];
		}
	}

	cout << ans << '\n';
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 13 / 13
• Subtask 4: 10 / 10
• Subtask 5: 20 / 20
• Subtask 6: 17 / 17
• Subtask 7: 25 / 25