Submission #764687

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
764687	2023-06-23T21:07:23 Z	NK_	Watching (JOI13_watching)	C++17	100 / 100	538 ms	16184 KB

watching

// Success consists of going from failure to failure without loss of enthusiasm
#include <bits/stdc++.h>

using namespace std;

#define nl '\n'

template<class T> using V = vector<T>;

const int INF = 1e9+10;

int main() {
	cin.tie(0)->sync_with_stdio(0);
	
	int N, P, Q; cin >> N >> P >> Q;
	P = min(P, N + 1), Q = min(Q, N + 1);

	V<int> A(N); for(auto& x : A) cin >> x;
	sort(begin(A), end(A));

	auto check = [&](int w) {
		V<V<int>> dp(N + 1, V<int>(P + 1, INF));
		dp[0][0] = 0;
		int RW = 0, R2W = 0;
		for(int i = 0; i < N; i++) for(int p = 0; p <= P; p++) {
			// cout << i << " <-> " << p << endl;
			if (p + 1 <= P) {
				int x = A[i] + w - 1;
				while(RW < N && A[RW] <= x) RW++;
				// cout << i << " " << RW << endl;
				dp[RW][p+1] = min(dp[RW][p+1], dp[i][p] + 1);
			}

			{
				int x = A[i] + 2 * w - 1;
				while(R2W < N && A[R2W] <= x) R2W++;
				// cout << i << " " << R2W << endl;
				dp[R2W][p] = min(dp[R2W][p], dp[i][p] + 1);
			}
			// cout << endl;
		}

		bool ans = 0;
		for(int p = 0; p <= P; p++) {
			int q = dp[N][p] - p;
			if (q <= Q) ans = 1;
		}

		return ans;
	};

	int lo = 1, hi = INF;
	while(lo < hi) {
		int mid = (lo + hi) / 2;

		if (check(mid)) hi = mid;
		else lo = mid + 1;
	}

	cout << lo << nl;



    return 0;
}

Subtask #1

50.0 / 50.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Correct	0 ms	212 KB	Output is correct
3	Correct	0 ms	212 KB	Output is correct
4	Correct	1 ms	340 KB	Output is correct
5	Correct	1 ms	212 KB	Output is correct
6	Correct	1 ms	340 KB	Output is correct
7	Correct	1 ms	212 KB	Output is correct
8	Correct	1 ms	212 KB	Output is correct
9	Correct	1 ms	212 KB	Output is correct
10	Correct	1 ms	212 KB	Output is correct
11	Correct	1 ms	340 KB	Output is correct
12	Correct	1 ms	340 KB	Output is correct
13	Correct	1 ms	212 KB	Output is correct
14	Correct	1 ms	212 KB	Output is correct
15	Correct	1 ms	212 KB	Output is correct

Subtask #2

50.0 / 50.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	3 ms	340 KB	Output is correct
2	Correct	0 ms	212 KB	Output is correct
3	Correct	388 ms	12212 KB	Output is correct
4	Correct	538 ms	16184 KB	Output is correct
5	Correct	21 ms	1076 KB	Output is correct
6	Correct	528 ms	16128 KB	Output is correct
7	Correct	5 ms	468 KB	Output is correct
8	Correct	31 ms	1460 KB	Output is correct
9	Correct	179 ms	6332 KB	Output is correct
10	Correct	497 ms	15328 KB	Output is correct
11	Correct	24 ms	1092 KB	Output is correct
12	Correct	241 ms	8124 KB	Output is correct
13	Correct	5 ms	468 KB	Output is correct
14	Correct	6 ms	468 KB	Output is correct
15	Correct	6 ms	468 KB	Output is correct