Submission #824685

#	Time	Username	Problem	Language	Result	Execution time	Memory
824685		thimote75	Carnival Tickets (IOI20_tickets)	C++14	27 / 100	564 ms	73112 KiB

tickets

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

using idata = vector<int>;
using igrid = vector<idata>;

using di = pair<int, int>;
using vd = vector<di>;

int find_maximum(signed K, vector<vector<signed>> x) {
	assert(K == 1);

	int N = x.size(); int M = x[0].size(); int H = N >> 1;

	idata minv(N, 1e16), maxv(N, -1e16);
	for (int i = 0; i < N; i ++) {
		for (int u : x[i]) {
			minv[i] = min(minv[i], u);
			maxv[i] = max(maxv[i], u);
		}
	}

	int result = -1; idata ub;
	for (int mid = 0; mid < N; mid ++) {
		int locr = 0;

		idata used_bot = { mid };

		vd values;
		for (int i = 0; i < N; i ++) {
			if (i == mid) continue ;

			values.push_back({
				minv[i] > minv[mid] ? - 1e15 : minv[mid] - minv[i],
				maxv[i] < minv[mid] ? - 1e15 : maxv[i] - minv[mid]
			});
		}

		vd comp;
		int i = 0;
		
		for (const auto v : values) {
			if (i == mid) i ++;
			
			locr += v.second;
			comp.push_back({ v.first - v.second, i });
			i ++;
		}

		sort(comp.rbegin(), comp.rend());

		for (int i = 0; i + 1 < H; i ++) {
			locr += comp[i].first;
			used_bot.push_back(comp[i].second);
		}

		if (locr <= result) continue ;
		
		result = locr;
		ub.swap(used_bot);
	}

	vector<vector<signed>> allocations(N, vector<signed>(M, -1));

	vector<bool> used_bot(N, false);
	for (int u : ub) used_bot[u] = true;

	for (int i = 0; i < N; i ++) {
		int target = used_bot[i] ? minv[i] : maxv[i];

		for (int j = 0; j < M; j ++) {
			if (x[i][j] != target) continue ;

			allocations[i][j] = 0;
			break ;
		}
	}

	allocate_tickets(allocations);

	return result;
}

• 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