Submission #1125520

#	Time	Username	Problem	Language	Result	Execution time	Memory
1125520		Nomio	Watching (JOI13_watching)	C++20	0 / 100	1094 ms	327680 KiB

watching

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	int n, p, q;
	cin >> n >> p >> q;
	vector<ll> a(n + 1);
	a[0] = 0;
	for(int i = 1; i <= n; i++) {
		cin >> a[i];
	}
	sort(a.begin(), a.end());
	ll l = 1, r = 1e9;
	while(l < r) {
		ll mid = (l + r) / 2;
		int dp[p + 1][q + 1] {};
		bool w = 0;
		for(int i = 0; i <= p; i++) {
			for(int j = 0; j <= q; j++) {
				int x = dp[i - 1][j];
				int y = dp[i][j - 1];
				if(i - 1 >= 0 && x < n) {
					ll X = a[x + 1] + mid - 1;
					int x1 = upper_bound(a.begin(), a.end(), X) - a.begin() - 1;	
					dp[i][j] = max(dp[i][j], x1);
				}
				if(j - 1 >= 0 && y < n) {
					ll Y = a[y + 1] + mid * 2 - 1;
					int y1 = upper_bound(a.begin(), a.end(), Y)	- a.begin() - 1;
					dp[i][j] = max(dp[i][j], y1);	
				}
				if(dp[i][j] == n) w = 1;
			}
		}
		if(dp[p][q] == n || w) r = mid;
		else l = mid + 1;
	}
	cout << l << '\n';
	return 0;
}

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