Submission #1057125

#TimeUsernameProblemLanguageResultExecution timeMemory
1057125aufanCarnival Tickets (IOI20_tickets)C++17
100 / 100
401 ms63260 KiB
#include "tickets.h"
#include <bits/stdc++.h>

using namespace std;

long long find_maximum(int k, vector<vector<int>> a) {
	int n = (int)a.size(), m = (int)a[0].size();
	long long res = 0;
	vector<vector<int>> bad(n, vector<int>(m));
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < k; j++) {
			res -= a[i][j];
		}
	}

	priority_queue<array<int, 3>> pq;
	for (int i = 0; i < n; i++) {
		pq.push({a[i][m - 1] + a[i][k - 1], i, 0});
	}

	vector<int> cnt(n, k);
	for (int i = 0; i < n * k / 2; i++) {
		auto [x, j, d] = pq.top();
		pq.pop();

		res += x;
		cnt[j] -= 1;
		if (d + 1 <= k - 1) pq.push({a[j][m - 1 - (d + 1)] + a[j][k - 1 - (d + 1)], j, d + 1});
	}

	vector<int> pl(n, 0), pr(n, m - 1);
	vector<vector<int>> ans(n, vector<int>(m, -1));
	for (int i = 0; i < k; i++) {
		vector<int> ord(n);
		iota(ord.begin(), ord.end(), 0);
		sort(ord.begin(), ord.end(), [&](int x, int y) {
			return cnt[x] > cnt[y];
		});
		
		for (int j = 0; j < n / 2; j++) {
			ans[ord[j]][pl[ord[j]]++] = i;
			cnt[ord[j]] -= 1;
		}

		for (int j = n / 2; j < n; j++) {
			ans[ord[j]][pr[ord[j]]--] = i;
		}
	}

	allocate_tickets(ans);

	return res;
}
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