Submission #301164

#	Time	Username	Problem	Language	Result	Execution time	Memory
301164		luciocf	Carnival Tickets (IOI20_tickets)	C++14	25 / 100	1061 ms	63300 KiB

tickets

#include <bits/stdc++.h>
#include "tickets.h"
 
#define ff first
#define ss second
 
using namespace std;
 
typedef pair<int, int> pii;
typedef long long ll;
 
const int maxn = 1510;
 
int dp[maxn][maxn];

int turno[maxn][maxn];
 
int ord[maxn];
int qtd[maxn], ptr_l[maxn], ptr_r[maxn];
 
ll find_maximum(int k, vector<vector<int>> x)
{
	int n = x.size();
	int m = x[0].size();
 
	ll ans = 0;

	priority_queue<pair<int, pii>> fila;

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

		fila.push({x[i][m-1], {i, m-1}});
		qtd[i] = 0, ord[i] = i;
		ptr_l[i] = 0, ptr_r[i] = m-1;
	}

	for (int t = 0; t < (n*k)/2; t++)
	{
		auto pp = fila.top(); fila.pop();

		ans += 1ll*pp.ff;
		
		if (qtd[pp.ss.ff] == m) continue;

		qtd[pp.ss.ff]++;
		fila.push({x[pp.ss.ff][pp.ss.ss-1], {pp.ss.ff, pp.ss.ss-1}});
	}

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

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

			turno[j][ptr_r[j]] = r;
			ptr_r[j]--;
			qtd[j]--;
		}

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

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

			turno[j][ptr_l[j]] = r;
			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: 0 / 16
• Subtask 3: 0 / 14
• Subtask 4: 14 / 14
• Subtask 5: 0 / 12
• Subtask 6: 0 / 23
• Subtask 7: 0 / 10