Submission #303056

#	Time	Username	Problem	Language	Result	Execution time	Memory
303056		tutis	Carnival Tickets (IOI20_tickets)	C++17	39 / 100	3099 ms	2097156 KiB

tickets

#include "tickets.h"
#include <vector>
#include <bits/stdc++.h>
using namespace std;
long long find_maximum(int k, vector<vector<int>> x) {
	int n = x.size();
	int m = x[0].size();
	vector<vector<int>> answer(n, vector<int>(m, -1));
	long long ret = 0;
	int mxp = n / 2 * k;
	pair<long long, int> mx[n + 1][mxp + 1];
	for (int i = 0; i <= n; i++)
		for (int j = 0; j <= mxp; j++)
			mx[i][j] = { -1e18, 0};
	mx[0][0] = {0, 0};
	for (int i = 0; i < n; i++)
	{
		long long del = 0;
		for (int c = 0; c < k; c++)
			del -= x[i][c];
		for (int p = 0; p <= k; p++)
		{
			for (int a = 0; a + p <= mxp; a++)
				mx[i + 1][a + p] = max(mx[i + 1][a + p], {mx[i][a].first + del, p});
			if (p < k)
			{
				del += x[i][k - 1 - p];
				del += x[i][m - 1 - p];
			}
		}
	}
	int p = mxp;
	int M[n], P[n];
	ret = mx[n][p].first;
	for (int i = n - 1; i >= 0; i--)
	{
		int pp = mx[i + 1][p].second;
		p -= pp;
		P[i] = pp;
		M[i] = k - P[i];
	}
	int a[n];
	int b[n];
	for (int i = 0; i < n; i++)
	{
		a[i] = 0;
		b[i] = m - 1;
	}
	for (int g = 0; g < k; g++)
	{
		pair<int, int>x[n];
		for (int i = 0; i < n; i++)
			x[i] = {P[i], i};
		sort(x, x + n);
		for (int i = 0; i < n / 2; i++)
		{
			int id = x[i].second;
			answer[id][a[id]] = g;
			a[id]++;
			M[id]--;
		}
		for (int i = n / 2; i < n; i++)
		{
			int id = x[i].second;
			answer[id][b[id]] = g;
			b[id]--;
			P[id]--;
		}
	}
	allocate_tickets(answer);
	return ret;
}

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