Submission #833018

#	Time	Username	Problem	Language	Result	Execution time	Memory
833018		Johann	Carnival Tickets (IOI20_tickets)	C++14	25 / 100	871 ms	62824 KiB

tickets

#include "tickets.h"
#include "bits/stdc++.h"
using namespace std;

typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int, int> pii;
typedef vector<pii> vpii;
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()

long long find_maximum(int K, std::vector<std::vector<int>> x)
{
	int N = x.size();
	int M = x[0].size();

	ll value = 0;
	vvi ans(N, vi(M, -1));

	vpii A;
	for (int i = 0; i < N; ++i)
		for (int j = 0; j < M; ++j)
			A.push_back({x[i][j], i * M + j});

	sort(all(A));
	for (int i = 0; i < N * M / 2; ++i)
		value -= A[i].first;
	for (int i = N * M / 2; i < N * M; ++i)
		value += A[i].first;
	A.resize(N * M / 2);
	sort(all(A), [&](const pii &a, const pii &b)
		 { return a.second / M < b.second / M; });
	int k = 0;
	for (pii tmp : A)
		ans[tmp.second / M][tmp.second % M] = (k++ % M);

	for (int i = 0; i < N; ++i)
	{
		vi V;
		for (int j = 0; j < M; ++j)
			if (ans[i][j] != -1)
				V.push_back(ans[i][j]);
		sort(all(V));
		reverse(all(V));
		k = 0;
		for (int j = 0; j < M; ++j)
		{
			while (!V.empty() && k == V.back())
				k++, V.pop_back();
			if (ans[i][j] == -1)
				ans[i][j] = k++;
		}
	}

	allocate_tickets(ans);

	return value;
}

• 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