Submission #301098

#	Time	Username	Problem	Language	Result	Execution time	Memory
301098		luciocf	Carnival Tickets (IOI20_tickets)	C++14	27 / 100	798 ms	61684 KiB

tickets

#include <bits/stdc++.h>
#include "tickets.h"

using namespace std;

typedef long long ll;

const int maxn = 1510;

int turno[maxn][maxn];
int ord[maxn];

int ptr_l[maxn], ptr_r[maxn];

ll find_maximum(int k, vector<vector<int>> x)
{
	int n = x.size();
	int m = x[0].size();

	for (int i = 0; i < n; i++)
	{
		memset(turno[i], -1, sizeof turno[i]);
		ord[i] = i, ptr_l[i] = 0, ptr_r[i] = m-1;
	}

	ll ans = 0;

	for (int r = 0; r < k; r++)
	{
		sort(ord, ord+n, [&] (int a, int b) {return x[a][ptr_l[a]]+x[a][ptr_r[a]] > x[b][ptr_l[b]]+x[b][ptr_r[b]];});

		for (int i = 0; i < n/2; i++)
		{
			int j = ord[i];

			turno[j][ptr_r[j]] = r;

			ans += 1ll*x[j][ptr_r[j]];

			ptr_r[j]--;
		}

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

			turno[j][ptr_l[j]] = r;

			ans -= 1ll*x[j][ptr_l[j]];

			ptr_l[j]++;
		}
	}

	vector<vector<int>> S;
		
	for (int i = 0; i < n; i++)
	{
		vector<int> y;
		y.resize(m);
		
		for (int j = 0; j < m; j++)
			y[j] = turno[i][j];

		S.push_back(y);
	}

	allocate_tickets(S);
	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