Submission #1000090

#	Time	Username	Problem	Language	Result	Execution time	Memory
1000090		phoenix	Carnival Tickets (IOI20_tickets)	C++17	27 / 100	321 ms	73216 KiB

tickets

#include "tickets.h"
#include <vector>
#include <bits/stdc++.h>

using namespace std;

long long func(vector<int> a) {
	sort(a.begin(), a.end());
	long long ans = 0;
	for (int i = 0; i < (int)a.size(); i++) {
		ans += (i * 2 < (int)a.size() ? -1 : +1) * a[i];
	}
	return ans;
}

long long find_maximum(int k, vector<vector<int>> x) {
	int n = x.size();
	int m = x[0].size();
	vector<vector<int>> answer(n, vector<int>(m, -1));
	vector<int> l(n, 0), r(n, m - 1);
	
	long long ans = 0;
	for (int iter = 0; iter < k; iter++) {
		vector<bool> t(n, false);
		long long val = 0;
		vector<int> ord(n);
		for (int i = 0; i < n; i++) {
			val += -x[i][l[i]];
			ord[i] = i;
		}	
		sort(ord.begin(), ord.end(), [&](int a, int b) {
			return (x[a][l[a]] + x[a][r[a]]) > (x[b][l[b]] + x[b][r[b]]); 
		});
		for (int i = 0; i * 2 < n; i++) {
			int j = ord[i];
			val += x[j][l[j]] + x[j][r[j]];
			t[j] = true;
		}
		ans += val;
		for (int i = 0; i < n; i++) {
			if (t[i]) {
				answer[i][r[i]] = iter;
				r[i]--;
			} else {
				answer[i][l[i]] = iter;
				l[i]++;
			}
		}
	}
	
	allocate_tickets(answer);
	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