Submission #1050414

#	Time	Username	Problem	Language	Result	Execution time	Memory
1050414		MercubytheFirst	Carnival Tickets (IOI20_tickets)	C++17	27 / 100	286 ms	88912 KiB

tickets

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


long long find_maximum(signed k, std::vector<std::vector<signed>> x) {
	ll n = x.size();
	ll m = x[0].size();
	vector<vector<signed> > answer(n, vector<signed>(m, -1));
	vector<deque<pair<ll, ll> > > nums(n);
	for(ll i = 0; i < n; ++i) {
		for(ll j = 0; j < m; ++j) {
			nums[i].push_back({x[i][j], j});
		}
	}
	ll totalsum = 0;
	for(ll round = 0; round < k; ++round) {
		vector<pii> sums(n);
		for(ll i = 0; i < n; ++i) {
			sums[i] = {nums[i].front().first + nums[i].back().first, i};
		}
		sort(sums.begin(), sums.end());
		for(ll i = 0; i < n/2; ++i) {
			const ll idx1 = sums[i].second;
			const ll idx2 = nums[idx1].front().second;
			totalsum -= nums[idx1].front().first;
			answer[idx1][idx2] = round;
			nums[idx1].pop_front();
		}
		for(ll i = n/2; i < n; ++i) {
			const ll idx1 = sums[i].second;
			const ll idx2 = nums[idx1].back().second;
			totalsum += nums[idx1].back().first;
			answer[idx1][idx2] = round;
			nums[idx1].pop_back();
		}
	}
	allocate_tickets(answer);
	return totalsum;
}


/*
4 2 1
5 9
1 4
3 6
2 7

2 3 2
0 2 5
1 1 3
*/

• 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