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Submission #1058891

# Submission time Handle Problem Language Result Execution time Memory
1058891 2024-08-14T14:49:14 Z vjudge1 Watching (JOI13_watching) C++17
100 / 100
 233 ms 14940 KB 
#include <iostream>
#include <algorithm>
using namespace std;

int n, p, q, a[2005], dp[2005][2005];

int searchLowerBound(int x) {
	int l = 0, r = n - 1, m, ans = n;
	while (l <= r) {
		m = l + r >> 1;
		if (a[m] >= x) {
			r = m - 1;
			ans = m;
		}
		else l = m + 1;
	}
	return ans;
}

signed main() {
	ios::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	cin >> n >> p >> q;
	if (p + q >= n) {
		cout << 1;
		return 0;
	}
	for (int i = 0; i < n; i++) cin >> a[i];
	int l = 1, r = 1e9, w, ans = -1;
	sort(a, a + n);
	while (l <= r) {
		w = l + r >> 1;
		for (int i = 0; i <= p; i++) for (int j = 0; j <= q; j++) dp[i][j] = 0;
		for (int i = 0; i <= p; i++) for (int j = 0; j <= q; j++) {
			if (dp[i][j] == n) {
				ans = w;
				r = w - 1;
				goto end;
			}
			dp[i + 1][j] = max(dp[i + 1][j], searchLowerBound(a[dp[i][j]] + w));
			dp[i][j + 1] = max(dp[i][j + 1], searchLowerBound(a[dp[i][j]] + 2 * w));
		}
		l = w + 1;
		end:;
	}
	cout << ans;
	return 0;
}

Compilation message

watching.cpp: In function 'int searchLowerBound(int)':
watching.cpp:10:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   10 |   m = l + r >> 1;
      |       ~~^~~
watching.cpp: In function 'int main()':
watching.cpp:32:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   32 |   w = l + r >> 1;
      |       ~~^~~

Subtask #1
50.0 / 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 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 600 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 1 ms 2392 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 30 ms 2652 KB Output is correct
9 Correct 42 ms 6612 KB Output is correct
10 Correct 57 ms 14940 KB Output is correct
11 Correct 62 ms 2652 KB Output is correct
12 Correct 233 ms 8852 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct