Submission #1032920

#	Time	Username	Problem	Language	Result	Execution time	Memory
1032920		Zicrus	Carnival Tickets (IOI20_tickets)	C++17	0 / 100	1 ms	348 KiB

tickets

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

typedef long long ll;

ll sub1(int k, vector<vector<int>> x) {
    vector<int> s(x.size());
    for (int i = 0; i < x.size(); i++) s[i] = x[i][0];
    sort(s.begin(), s.end());
    ll median = s[s.size() / 2];
    ll sum = 0;
    for (auto &e : s) sum += abs(e - median);
    allocate_tickets(vector<vector<int>>(s.size(), vector<int>(1)));
    return sum;
}

ll sub2(int k, vector<vector<int>> x) {
    ll n = x.size(), m = x[0].size();
    vector<pair<ll, ll>> avgId(n);
    for (int i = 0; i < n; i++) {
        avgId.push_back({x[i].front() + x[i].back(), i});
    }
    sort(avgId.begin(), avgId.end());
    vector<ll> choices(n);
    vector<vector<int>> res(n, vector<int>(m, -1));
    for (int i = 0; i < n/2; i++) {
        choices[i] = x[avgId[i].second].front();
        res[avgId[i].second].front() = 0;
    }
    for (int i = n/2; i < n; i++) {
        choices[i] = x[avgId[i].second].back();
        res[avgId[i].second].back() = 0;
    }
    ll median = choices[n/2];
    ll sum = 0;
    for (auto &e : choices) sum += abs(e - median);
    allocate_tickets(res);
    return sum;
}

ll find_maximum(int k, vector<vector<int>> x) {
    if (k > 1) return sub1(k, x);
    return sub2(k, x);
}

Compilation message (stderr)

tickets.cpp: In function 'll sub1(int, std::vector<std::vector<int> >)':
tickets.cpp:9:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |     for (int i = 0; i < x.size(); i++) s[i] = x[i][0];
      |                     ~~^~~~~~~~~~

• 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