Submission #976025

#	Time	Username	Problem	Language	Result	Execution time	Memory
976025		vjudge1	구경하기 (JOI13_watching)	C++17	0 / 100	2 ms	512 KiB

watching

#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 <= 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 <= 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
• Subtask 2: 0 / 50