Submission #384862

#	Time	Username	Problem	Language	Result	Execution time	Memory
384862		ngpin04	Global Warming (CEOI18_glo)	C++14	100 / 100	70 ms	4716 KiB

glo

#include <bits/stdc++.h>

using namespace std;
const int N = 2e5 + 5;

int dp[N];
int a[N];
int n,x;

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> n >> x;
	for (int i = 1; i <= n; i++)
		cin >> a[i];

	vector <int> lis(n, 1e9 + 1);
	for (int i = 1; i <= n; i++) {
		int j = lower_bound(lis.begin(), lis.end(), a[i]) - lis.begin();
		dp[i] = j + 1;
		lis[j] = a[i];
	}

	lis.assign(n, 1e9 + 1);
	int ans = 0;
	for (int i = n; i >= 1; i--) {
		int j = lower_bound(lis.begin(), lis.end(), -(a[i] - x)) - lis.begin();
		int k = lower_bound(lis.begin(), lis.end(), -a[i]) - lis.begin();
		ans = max(ans, dp[i] + j);
		lis[k] = -a[i];
	}
	cout << ans;
	return 0;
}

• 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