Submission #652071

#	Time	Username	Problem	Language	Result	Execution time	Memory
652071		mychecksedad	Carnival Tickets (IOI20_tickets)	C++17	0 / 100	1 ms	212 KiB

tickets

#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
#define pb push_back
#define all(x) x.begin(), x.end()

void allocate_tickets(vector<vector<int>> _x);

long long find_maximum(int k, vector<vector<int>> _arr) {
	vector<vector<ll>> arr (_arr.size());
	for(int i = 0; i < _arr.size(); ++i){
		for(int x: _arr[i]) arr[i].pb(x);
	}
	int n = arr.size();
	int m = arr[0].size();
	vector<vector<int>> answer;
	vector<pair<ll, int>> a;
	


	for (int i = 0; i < n; i++) {
		std::vector<int> row(m, -1);
		answer.push_back(row);
		a.pb({arr[i][0] + arr[i][m - 1], i});
	}
	sort(all(a));
	ll ans = 0;

	for(int i = 0; i < n/2; ++i){
		int x = a[n - i - 1].second, y = a[i].second;
		ans += arr[x][1] - arr[y][0];
		answer[x][m - 1] = 0;
		answer[y][0] = 0;
	}

	allocate_tickets(answer);
	return ans;
}

Compilation message (stderr)

tickets.cpp: In function 'long long int find_maximum(int, std::vector<std::vector<int> >)':
tickets.cpp:11:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |  for(int i = 0; i < _arr.size(); ++i){
      |                 ~~^~~~~~~~~~~~~

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