제출 #435830

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
435830		prvocislo	카니발 티켓 (IOI20_tickets)	C++17	49 / 100	3086 ms	84876 KiB

tickets

#include "tickets.h"
#include <bits/stdc++.h>
typedef long long ll;
using namespace std;

const int maxn = 2005;
vector<int> cntm(maxn, 0);
bool cmp(const int &i, const int &j) { return cntm[i] < cntm[j]; }
long long find_maximum(int k, vector<vector<int>> x) {
	int n = x.size();
	int m = x[0].size();
	ll ans = 0;
	vector<int> mi(n, 0); // kolko minusov mame v tomto riadku
	priority_queue<pair<ll, int> > p1; // vymenime nejake velke cislo za male cislo
	for (int i = 0; i < n/2; i++) // zoberieme len maxima
	{
		for (int j = 0; j < k; j++)
		{
			p1.push({-x[i][j] - x[i][m - k + j], i});
			ans += x[i][m - k + j];
		}
	}
	priority_queue<pair<ll, int> > p2;
	for (int i = n/2; i < n; i++) // zoberieme len minima
	{
		mi[i] = k;
		for (int j = 0; j < k; j++)
		{
			p2.push({x[i][j] + x[i][m - k + j], i});
			ans -= x[i][j];
		}
	}
	while (p1.top().first + p2.top().first > 0) // vieme to urobit aj lepsie
	{
		ans += p1.top().first + p2.top().first;
		mi[p1.top().second]++;
		mi[p2.top().second]--;
		p1.pop(), p2.pop();
	}
	vector<int> v(k);
	vector<vector<int> > s(n, vector<int>(m, -1));
	for (int i = 0; i < k; i++) v[i] = i;
	for (int i = 0; i < n; i++)
	{
		int cnt = 0;
		nth_element(v.begin(), v.begin() + mi[i], v.end(), cmp);
		for (int j = 0; j < mi[i]; j++)
			cntm[v[j]]++, s[i][j] = v[cnt++];
		for (int j = m - (k - mi[i]); j < m; j++)
			s[i][j] = v[cnt++];
	}
	allocate_tickets(s);
	return ans;
}

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