Submission #704135

#	Time	Username	Problem	Language	Result	Execution time	Memory
704135		bebra	Carnival Tickets (IOI20_tickets)	C++17	11 / 100	2 ms	596 KiB

tickets

#include "tickets.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
 
#define dbg(x) cerr << #x << ": " << x << endl;
 
 
ll find_maximum(int k, vector<vector<int>> x) {
    int n = x.size();
    int m = x[0].size();

    vector<vector<int>> res(n, vector<int>(m, -1));
    
    ll total_ans = 0;
    {
        vector<vector<int>> s(n, vector<int>(m, -1));
     
        vector<int> a(n);
        iota(a.begin(), a.end(), 0);
        sort(a.begin(), a.end(), [&](int lhs, int rhs) {
            return x[lhs][0] < x[rhs][0];
        });
        for (int i = 0; i < n / 2; ++i) {
            s[a[i]][0] = 0;
        }
     
        int mn = 1e9 + 5;
        for (int i = n / 2; i < n; ++i) {
            s[a[i]][m - 1] = 0;
            mn = min(mn, x[a[i]][m - 1]);
        }
     
        ll ans = 0;
        for (int i = 0; i < n / 2; ++i) {
            ans += abs(x[a[i]][0] - mn);
        }
        for (int i = n / 2; i < n; ++i) {
            ans += abs(x[a[i]][m - 1] - mn);
        }
        res = s;
        total_ans = ans;
    }

    {
        vector<vector<int>> s(n, vector<int>(m, -1));
     
        vector<int> a(n);
        iota(a.begin(), a.end(), 0);
        sort(a.begin(), a.end(), [&](int lhs, int rhs) {
            return x[lhs][m - 1] > x[rhs][m - 1];
        });
        for (int i = 0; i < n / 2; ++i) {
            s[a[i]][m - 1] = 0;
        }
     
        int mx = 0;
        for (int i = n / 2; i < n; ++i) {
            s[a[i]][0] = 0;
            mx = max(mx, x[a[i]][0]);
        }
     
        ll ans = 0;
        for (int i = 0; i < n / 2; ++i) {
            ans += abs(x[a[i]][m - 1] - mx);
        }
        for (int i = n / 2; i < n; ++i) {
            ans += abs(x[a[i]][0] - mx);
        }
        if (ans > total_ans) {
            total_ans = ans;
            res = s;
        }
    }
 
    allocate_tickets(res);
    return total_ans;
}
 
 
// int main() {
//     int n, m, k;
//     cin >> n >> m >> k;
 
//     vector<vector<int>> a(n, vector<int>(m));
//     for (int i = 0; i < n; ++i) {
//         for (int j = 0; j < m; ++j) {
//             cin >> a[i][j];
//         }
//     }
 
//     cout << find_maximum(k, a);
// }

• Subtask 1: 11 / 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