Submission #1172535

#	Time	Username	Problem	Language	Result	Execution time	Memory
1172535		hyakup	Carnival Tickets (IOI20_tickets)	C++20	25 / 100	627 ms	75484 KiB

tickets

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

long long find_maximum(int k, vector<vector<int>> v){
	int n = v.size(), m = v[0].size();
	vector<pii> ordem;
	for( int i = 0; i < n; i++ ) for( int j = 0; j < m; j++ ) ordem.push_back({ v[i][j], i*m + j });

	sort( ordem.begin(), ordem.end() );

	vector<vector<int>> vmax(n), vmin(n);

	ll sum = 0;
	for( int i = 0; i < (int)ordem.size()/2; i++ ) vmin[ordem[i].second/m].push_back(ordem[i].second), sum -= ordem[i].first;
	for( int i = (int)ordem.size()/2; i < (int)ordem.size(); i++ ) vmax[ordem[i].second/m].push_back(ordem[i].second), sum += ordem[i].first;

  vector<vector<int>> resp(n, vector<int>(m, -1));

	for( int i = 0; i < k; i++ ){
    vector<pii> aux;

    for( int j = 0; j < n; j++ ) aux.push_back({ (int)vmax[j].size() - (int)vmin[j].size(), j });
    sort( aux.begin(), aux.end() );

    for( int j = 0; j < n/2; j++ ){
      int id = vmin[aux[j].second].back(); vmin[aux[j].second].pop_back();
      resp[id/m][id%m] = i;
    }
    for( int j = n/2; j < n; j++ ){
      int id = vmax[aux[j].second].back(); vmax[aux[j].second].pop_back();
      resp[id/m][id%m] = i;
    }
	}
	allocate_tickets(resp);

	return sum;
}

• 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