Submission #623562

#	Time	Username	Problem	Language	Result	Execution time	Memory
623562		JeanBombeur	Carnival Tickets (IOI20_tickets)	C++17	100 / 100	660 ms	71944 KiB

tickets

#include "tickets.h"
#include <vector>
#include <algorithm>
using namespace std;

//  <|°_°|>

//  M. Broccoli

const int MAX_COLORS = (1500);

pair <int, int> Optimal[MAX_COLORS * MAX_COLORS];

int NbSmall[MAX_COLORS];

long long find_maximum(int nbRounds, vector <vector <int>> Tickets) {
    
	int nbColors = Tickets.size();
	int nbTickets = Tickets[0].size();
	
	long long answer = 0;
	
	for (int i = 0; i < nbColors; i ++)
	{
	    for (int j = 0; j < nbRounds; j ++)
	    {
	        Optimal[nbRounds * i + j] = {Tickets[i][j] + Tickets[i][j + nbTickets - nbRounds], i};
	        answer += Tickets[i][j + nbTickets - nbRounds];
	    }
	}
	sort(Optimal, Optimal + nbColors * nbRounds);
	for (int i = 0; i < (nbColors * nbRounds) / 2; i ++)
	{
	    NbSmall[Optimal[i].second] ++;
	    answer -= Optimal[i].first;
	}
	
	int cnt = nbRounds;
    vector <int> row(nbTickets, -1);
	vector <vector <int>> Answer(nbColors, row);
	for (int i = 0; i < nbColors; i ++)
	{
	    for (int j = 0; j < NbSmall[i]; j ++)
	    {
	        Answer[i][j] = -- cnt;
	        if (!cnt)
	            cnt = nbRounds;
	    }
	    for (int j = 1; j <= nbRounds - NbSmall[i]; j ++)
	    {
	        Answer[i][nbTickets - j] = cnt - j < 0 ? cnt - j + nbRounds : cnt - j;
	    }
	}

	allocate_tickets(Answer);
	return answer;
}

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