Submission #416737

#	Time	Username	Problem	Language	Result	Execution time	Memory
416737		SuhaibSawalha1	Carnival Tickets (IOI20_tickets)	C++17	27 / 100	2092 ms	157212 KiB

tickets

#include "tickets.h"
#include <bits/stdc++.h>
using namespace std;
 
long long calc (vector<long long> &a) {
	int n = a.size();
	long long sum = accumulate(a.begin(), a.end(), 0LL), m = LLONG_MAX, sum2 = 0;
	sort(a.begin(), a.end());
	for (int i = 0; i < n; ++i) {
		sum -= a[i];
		m = min(m, a[i] * i - sum2 + sum - a[i] * (n - i - 1));
		sum2 += a[i];
	}
	return m;
}
 
long long find_maximum(int k, vector<vector<int>> a) {
	int n = a.size();
	int m = a[0].size();
	long long ans = 0;
	vector<vector<int>> g(n, vector<int>(m, -1));
	vector<set<array<int, 2>>> a2(n);
	set<array<int, 2>, greater<array<int, 2>>> ms;
	#define ar(i) {- (*a2[i].begin())[0] - (*a2[i].rbegin())[0], i}
	for (int i = 0; i < n; ++i) {
		for (int j = 0; j < m; ++j) {
			a2[i].insert({a[i][j], j});
		}
		ms.insert(ar(i));
	}
	for (int kc = 0; kc < k; ++kc) {
		vector<long long> ask;
		int t = 0;
		set<array<int, 2>, greater<array<int, 2>>> ms2;
		for (auto e : ms) {
			int v, ind;
			if (t < n / 2) {
				v = (*a2[e[1]].begin())[0], ind = (*a2[e[1]].begin())[1];
			}
			else {
				v = (*a2[e[1]].rbegin())[0], ind = (*a2[e[1]].rbegin())[1];
			}
			ask.push_back(v);
			g[e[1]][ind] = kc;
			a2[e[1]].erase({v, ind});
			if (kc < k - 1) {
				ms2.insert(ar(e[1]));
			}
			++t;
		}
		ms = ms2;
		ans += calc(ask);
	}
	allocate_tickets(g);
	return ans;
}

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