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Submission #976024

# Submission time Handle Problem Language Result Execution time Memory
976024 2024-05-06T05:25:21 Z vjudge1 Watching (JOI13_watching) C++17
0 / 100
 2 ms 348 KB 
#include <bits/stdc++.h>
#define int long long
#define f first
#define s second
#define pb push_back
#define endl '\n'
using namespace std;

int N,K,B,a[2005];

bool check(int x) {
	priority_queue<pair<int, pair<int, int>>> p;
	pair<int, int> cst[2005];
	for (int i = 1; i <= 2003; i++) cst[i] = {-1, -1};
	p.push({1, {B, K}});
	while (!p.empty()) {
		auto cur = p.top();
		p.pop();
		int idx = cur.f;
		int ku = cur.s.s;
		int bu = cur.s.f;
		// cout << idx << ' ' << bu << ' ' << ku << endl;
		if (idx == N + 1) return true;
		int nxt_idx = idx;
		if (ku > 0) {
			while (a[nxt_idx + 1] - a[idx] + 1 <= x && nxt_idx + 1 <= N) nxt_idx++;
			pair<int, int> c = {bu, ku - 1};
			if (cst[nxt_idx + 1] < c) {
				p.push({nxt_idx + 1, c});
				cst[nxt_idx + 1] = c;
			}
		}
		if (bu > 0) {
			while (a[nxt_idx + 1] - a[idx] + 1 <= 2 * x && nxt_idx + 1 <= N) nxt_idx++;
			pair<int, int> c = {bu - 1, ku};
			if (cst[nxt_idx + 1] < c) {
				p.push({nxt_idx + 1, c});
				cst[nxt_idx + 1] = c;
			}
		}
	}
	return false;
}

void solve() {
	cin >> N >> K >> B;
	for (int i = 1; i <= N; i++) cin >> a[i];
	sort(a + 1, a + 1 + N);
	int l = 1;
	int r = 1e9;
	int ans = -1;
	while (l <= r) {
		int mid = (l + r) / 2;
		if (check(mid)) {
			ans = mid;
			r = mid - 1;
		}
		else l = mid + 1;
	}
	assert(ans != -1);
	cout << ans << endl;
}

int32_t main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	int tttt = 1;
	// cin >> tttt;
	while (tttt--) solve();
}

Subtask #1
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Incorrect 1 ms 344 KB Output isn't correct
10 Halted 0 ms 0 KB -

Subtask #2
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 2 ms 348 KB Output is correct
4 Correct 2 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 2 ms 348 KB Output is correct
7 Incorrect 2 ms 348 KB Output isn't correct
8 Halted 0 ms 0 KB -