oj.uz

Submission #537053

# Submission time Handle Problem Language Result Execution time Memory
537053 2022-03-14T10:40:16 Z pavement Watching (JOI13_watching) C++17
50 / 100
 173 ms 31748 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif
#define int long long
#define mp make_pair
#define mt make_tuple
#define pb push_back
#define ppb pop_back
#define eb emplace_back
#define g0(a) get<0>(a)
#define g1(a) get<1>(a)
#define g2(a) get<2>(a)
#define g3(a) get<3>(a)
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
using db = double;
using ll = long long;
using ld = long double;
using ii = pair<int, int>;
using iii = tuple<int, int, int>;
using iiii = tuple<int, int, int, int>;
template<class key, class value = null_type, class cmp = less<key> >
using ordered_set = tree<key, value, cmp, rb_tree_tag, tree_order_statistics_node_update>;

int N, P, Q, A[2005], dp[2005][2005];

main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cin >> N >> P >> Q;
	P = min(N, P);
	Q = min(N, Q);
	for (int i = 1; i <= N; i++) cin >> A[i];
	sort(A + 1, A + 1 + N);
	int lo = 1, hi = A[N] - A[1], ans = -1;
	while (lo <= hi) {
		int mid = (lo + hi) >> 1;
		for (int i = 1, tmp = 0, tmp2 = 0; i <= N; i++) {
			while (A[tmp + 1] <= A[i] - mid) tmp++;
			while (A[tmp2 + 1] <= A[i] - 2 * mid) tmp2++;
			for (int j = 0; j <= P; j++)
				dp[i][j] = min(j ? dp[tmp][j - 1] : LLONG_MAX, dp[tmp2][j] + 1);
		}
		if (dp[N][P] <= Q) ans = mid, hi = mid - 1;
		else lo = mid + 1;
	}
	cout << ans << '\n';
}

Compilation message

watching.cpp:31:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   31 | main() {
      | ^~~~

Subtask #1
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 724 KB Output is correct
2 Incorrect 1 ms 212 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 8404 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 120 ms 31724 KB Output is correct
4 Correct 173 ms 31744 KB Output is correct
5 Correct 15 ms 9556 KB Output is correct
6 Correct 153 ms 31744 KB Output is correct
7 Correct 6 ms 8532 KB Output is correct
8 Correct 13 ms 10332 KB Output is correct
9 Correct 72 ms 20180 KB Output is correct
10 Correct 155 ms 31748 KB Output is correct
11 Correct 17 ms 9808 KB Output is correct
12 Correct 93 ms 23728 KB Output is correct
13 Correct 5 ms 8532 KB Output is correct
14 Correct 6 ms 8668 KB Output is correct
15 Correct 6 ms 8668 KB Output is correct