Submission #705842

#	Time	Username	Problem	Language	Result	Execution time	Memory
705842		finn__	Carnival Tickets (IOI20_tickets)	C++17	100 / 100	765 ms	60520 KiB

tickets

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

long long find_maximum(int k, vector<vector<int>> x)
{
    long long value = 0;
    for (size_t i = 0; i < x.size(); i++)
        for (size_t j = 0; j < k; j++)
            value -= x[i][j];

    vector<size_t> y(x.size(), k);
    priority_queue<pair<int64_t, size_t>> q;
    for (size_t i = 0; i < x.size(); i++)
        q.emplace(x[i][k - 1] + x[i].back(), i);

    for (size_t z = 0; z < x.size() * k / 2; z++)
    {
        auto const [d, i] = q.top();
        q.pop();
        value += d;
        y[i]--;
        if (y[i])
            q.emplace(x[i][y[i] - 1] + x[i][x[i].size() - (k - y[i] + 1)], i);
    }

    vector<vector<int>> a(x.size(), vector<int>(x[0].size(), -1));

    for (size_t j = 0; j < k; j++)
    {
        vector<pair<size_t, size_t>> colors;
        for (size_t i = 0; i < x.size(); i++)
            colors.emplace_back(y[i], i);
        sort(colors.begin(), colors.end());
        for (size_t i = 0; i < x.size() / 2; i++)
            a[colors[i].second][x[i].size() - ((k - j) - colors[i].first)] = j;
        for (size_t i = x.size() / 2; i < x.size(); i++)
            a[colors[i].second][--y[colors[i].second]] = j;
    }

    allocate_tickets(a);
    return value;
}

Compilation message (stderr)

tickets.cpp: In function 'long long int find_maximum(int, std::vector<std::vector<int> >)':
tickets.cpp:9:30: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
    9 |         for (size_t j = 0; j < k; j++)
      |                            ~~^~~
tickets.cpp:29:26: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   29 |     for (size_t j = 0; j < k; j++)
      |                        ~~^~~

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