Submission #791628

#	Time	Username	Problem	Language	Result	Execution time	Memory
791628		acatmeowmeow	Watching (JOI13_watching)	C++11	0 / 100	223 ms	404 KiB

watching

#include <bits/stdc++.h>

using namespace std;

#define int long long 

const int N = 2e3;
int n, p, q, arr[N + 5];
pair<int, int> dp[N + 5][2];

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cin >> n >> p >> q;
	for (int i = 1; i <= n; i++) cin >> arr[i];
	sort(arr + 1, arr + n + 1);
	int l = 1, r = 1e9, ans = 1e9;
	while (l <= r) {
		int m = (l + r)/2;
		for (int i = 1; i <= n; i++) dp[i][0] = dp[i][1] = {-1, -1};
		dp[0][0] = dp[0][1] = {q, p};
		for (int i = 1; i <= n; i++) {
			for (int j = 1; j <= i; j++) {
				for (int k = 0; k < 2; k++) {
					int prevQ = dp[j - 1][k].first, prevP = dp[j - 1][k].second;
					if (prevQ && arr[i] - arr[j] + 1 <= 2*m) dp[i][0] = max(dp[i][0], {prevQ - 1, prevP});
					if (prevP && arr[i] - arr[j] + 1 <= m) dp[i][1] = max(dp[i][1], {prevQ, prevP - 1});
				}
			}
		}
		if (dp[n][0].first != -1 || dp[n][1].first != -1) ans = m, r = m - 1;
		else l = m + 1;
	}
	cout << ans << '\n';
	return 0;
}

• Subtask 1: 0 / 50
• Subtask 2: 0 / 50