Submission #1264721

#	Time	Username	Problem	Language	Result	Execution time	Memory
1264721		SDAdzs1tg	Watching (JOI13_watching)	C++20	100 / 100	648 ms	11896 KiB

watching

#include<bits/stdc++.h>
#define int long long
using namespace std;
const int maxn = 2001;
int n, p, q, a[maxn], dp[maxn][maxn];
bool check(int mid) {
    dp[0][0] = 0;
	for(int i = 0; i <= p; i++) {
	    for(int j = 0; j <= q; j++) {
	        dp[i][j] = 0;
	        if(i > 0) {
	            int last = dp[i - 1][j];
	            int t = upper_bound(a + 1, a + n + 1, a[min(n, last + 1)] + mid - 1) - a - 1;
	            dp[i][j] = max(dp[i][j], t);
	        }
	        if(j > 0) {
	            int last = dp[i][j - 1];
	            int t = upper_bound(a + 1, a + n + 1, a[min(n, last + 1)] + 2 * mid - 1) - a - 1;
	            dp[i][j] = max(dp[i][j], t);
	        }
	        if(dp[i][j] >= n) {
	            return true;
	        }
	    }
	}
	return false;
}
signed main () {
	cin >> n >> p >> q;
	for(int i = 1; i <= n; i++) cin >> a[i];
	sort(a + 1, a + n + 1);
	if(q + p >= n) {
		cout << 1;
		return 0;
	}
	int l = 1, r = 1e9;
	while(l <= r) {
		int mid = (l + r) / 2;
		if(check(mid)) {
			r = mid - 1;
		} 
		else l = mid + 1;
	}
	cout << l;
}

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