Submission #1291745

#	Time	Username	Problem	Language	Result	Execution time	Memory
1291745		kahoul	Carnival Tickets (IOI20_tickets)	C++20	0 / 100	1 ms	336 KiB

tickets

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

const long long INF = 1e18;

long long find_maximum(int k, vector<vector<int>> x) {
	int n = x.size();
	int m = x[0].size();

	vector<vector<int>> answer;

	for (int i = 0; i < n; i++) {
		vector<int> resp(m, -1);
		answer.push_back(resp);
	}

	vector<deque<pair<int, int>>> q;

	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			q[i].push_back({x[i][j], j});
		}
	}

	int resp = 0;

	for (int i = 0; i < k; i++) {
		vector<int> amt(2, 0);
		for (int j = 0; j < n; j++) {
			amt[x[j][i]]++;
		}

		if (amt[0] >= n / 2 && amt[1] >= n / 2) {
			vector<bool> used(n, 0);
			int need = n / 2;
			resp += n / 2;

			for (int j = 0; j < n; j++) {
				if (need == 0) break;
				auto [elm, idx] = q[j].front();

				if (elm == 1) continue;

				answer[j][idx] = i;
				q[j].pop_front();
				used[j] = 1;
				need--;
			}

			assert((need == 0));

			for (int j = 0; j < n; j++) {
				if (used[j]) continue;
				auto [elm, idx] = q[j].back();
				assert((elm == 1));

				answer[j][idx] = i;
				q[j].pop_back();
			}

			continue;
		}

		int least = 0, most = 1;
		if (amt[least] > amt[most]) swap(least, most);

		vector<bool> used(n, 0);
		int need = amt[least];
		resp += amt[least];

		for (int j = 0; j < n; j++) {
			if (need == 0) break;

			int elm, idx;
			if (least == 0) {
				elm = q[j].front().first;
				idx = q[j].front().second;
			} else {
				elm = q[j].back().first;
				idx = q[j].back().second;
			}

			if (elm != least) continue;

			answer[j][idx] = i;
			if (least == 0) {
				q[j].pop_front();
			} else {
				q[j].pop_back();
			}
			used[j] = 1;
			need--;
		}

		assert((need == 0));
	}

	allocate_tickets(answer);

	return resp;
}

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