Submission #416595

#	Time	Username	Problem	Language	Result	Execution time	Memory
416595		SuhaibSawalha1	Carnival Tickets (IOI20_tickets)	C++17	27 / 100	3075 ms	51316 KiB

tickets

#include "tickets.h"
#include <bits/stdc++.h>
using namespace std;
 
long long calc (vector<long long> &a) {
	int n = a.size();
	long long sum = accumulate(a.begin(), a.end(), 0LL), m = LLONG_MAX, sum2 = 0;
	sort(a.begin(), a.end());
	for (int i = 0; i < n; ++i) {
		sum -= a[i];
		m = min(m, a[i] * i - sum2 + sum - a[i] * (n - i - 1));
		sum2 += a[i];
	}
	return m;
}
 
long long find_maximum(int k, vector<vector<int>> a) {
	int n = a.size();
	int m = a[0].size();
	long long ans = 0;
	vector<vector<int>> g(n, vector<int>(m, -1));
	for (int kc = 0; kc < k; ++kc) {
		vector<vector<array<int, 2>>> a2(n);
		long long mxs = 0;
		vector<long long> ask;
		vector<array<int, 2>> ms;
		for (int i = 0; i < n; ++i) {
			for (int j = 0; j < m; ++j) {
				if (~a[i][j]) {
					a2[i].push_back({a[i][j], j});
				}
			}
			sort(a2[i].begin(), a2[i].end());
			mxs += a2[i].back()[0];
			ms.push_back({-a2[i][0][0] - a2[i].back()[0], i});
		}
		sort(ms.rbegin(), ms.rend());
		for (int i = 0; i < n / 2; ++i) {
			ask.push_back(a2[ms[i][1]][0][0]);
			g[ms[i][1]][a2[ms[i][1]][0][1]] = kc;
			a[ms[i][1]][a2[ms[i][1]][0][1]] = -1;
		}
		for (int i = 0; i < n; ++i) {
			if (count(g[i].begin(), g[i].end(), -1) == m - kc) {
				ask.push_back(a2[i].back()[0]);
				g[i][a2[i].back()[1]] = kc;
				a[i][a2[i].back()[1]] = -1;
			}
		}
		ans += calc(ask);
	}
	allocate_tickets(g);
	return ans;
}

• Subtask 1: 11 / 11
• Subtask 2: 16 / 16
• Subtask 3: 0 / 14
• Subtask 4: 0 / 14
• Subtask 5: 0 / 12
• Subtask 6: 0 / 23
• Subtask 7: 0 / 10