Submission #792068

#	Time	Username	Problem	Language	Result	Execution time	Memory
792068		mousebeaver	Carnival Tickets (IOI20_tickets)	C++14	25 / 100	418 ms	57700 KiB

tickets

#define ll long long
#define pll pair<ll, ll>
#include "tickets.h"
#include <bits/stdc++.h>
using namespace std;

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

	if(m == 1)
	{
		vector<vector<int>> output(n, vector<int> (1, 0));
		allocate_tickets(output);
		vector<ll> a(n);
		for(ll i = 0; i < n; i++)
		{
			a[i] = x[i][0];
		}
		sort(a.begin(), a.end());
		ll ans = 0;
		ll add = 0;
		for(ll i = n/2; i >= 0; i--)
		{
			add = a[n/2] - a[i];
			ans += add;
		}
		for(ll i = n/2+1; i < n; i++)
		{
			add = a[i] - a[n/2];
			ans += add;
		}
		return ans;
	}

	vector<ll> zcount(n, 0);
	for(ll i = 0; i < n; i++)
	{
		for(ll j = 0; j < m; j++)
		{
			zcount[i] += (x[i][j] == 0);
		}
	}
	vector<ll> zind(n, 0);
	vector<ll> oind(n, 0); //Index of first zero/one

	vector<vector<int>> output(n, vector<int> (m, -1));
	ll ans = 0;

	for(ll i = 0; i < k; i++)
	{
		vector<pll> zsort(n);
		for(ll j = 0; j < n; j++)
		{
			zsort[j] = {zcount[j], j};
		}
		sort(zsort.begin(), zsort.end());

		vector<bool> big(n, true);
		for(ll j = n/2; j < n; j++)
		{
			big[zsort[j].second] = false;
		}

		ll counter = 0;
		for(ll j = 0; j < n; j++)
		{
			if((big[j] && zcount[j] < m-i) || (!big[j] && zcount[j] == 0))
			{
				//Give a one
				while(x[j][oind[j]] != 1)
				{
					oind[j]++;
				}
				output[j][oind[j]] = i;
				oind[j]++;
				counter++;
			}
			else
			{
				//Give a zero
				while(x[j][zind[j]] != 0)
				{
					zind[j]++;
				}
				output[j][zind[j]] = i;
				zind[j]++;
				zcount[j]--;
			}
		}
		ans += min(counter, n-counter);
	}

	allocate_tickets(output);
	return ans;
}

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