Submission #540419

#	Time	Username	Problem	Language	Result	Execution time	Memory
540419		RaresFelix	Watching (JOI13_watching)	C++17	100 / 100	211 ms	32764 KiB

watching

#include <bits/stdc++.h>
#define MN 2071

using namespace std;

using ll = long long;

ll n, p, q, A[MN], DP[MN][MN];

bool ok(int len) {
	if(p + q >= n) return 1;
	///DP[poz][nr_mici]
	int lsmall = 1, lbig = 1;
	DP[1][0] = 1;
	DP[1][1] = 0;
	for(int i = 1; i <= n; ++i) {
		while(A[i] - A[lsmall] >= len) ++lsmall;
		while(A[i] - A[lbig] >= 2 * len) ++lbig;
		for(int j = 0; j <= min(p, n); ++j)
			DP[i][j] = min((!!j) * DP[lsmall-1][j-1] + (!j) * INT_MAX, DP[lbig-1][j] + 1);
	}
	return DP[n][p] <= q;
}
int main() {
    cin.tie(0)->sync_with_stdio(0);
    cin.exceptions(cin.failbit);
	cin >> n >> p >> q;
	for(int i = 1; i <= n; ++i) cin >> A[i];
	sort(A + 1, A + n + 1);
	ll st = 1, dr = 1e9, mij;
	while(st < dr) {
		mij = (st + dr) >> 1;
		if(ok(mij)) dr = mij;
		else st = mij + 1;
	}
	cout << st << "\n";
    return 0;
}

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