Submission #1297822

#	Time	Username	Problem	Language	Result	Execution time	Memory
1297822		kawhiet	Carnival Tickets (IOI20_tickets)	C++20	11 / 100	2 ms	836 KiB

tickets

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

long long get(int k, vector<vector<int>> x, vector<vector<int>> g) {
    int n = x.size();
    int m = x[0].size();
    vector<vector<int>> a(k);
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            if (g[i][j] == -1) continue;
            a[g[i][j]].push_back(x[i][j]);
        }
    }
    long long ret = 0;
    for (int i = 0; i < k; i++) {
        sort(a[i].begin(), a[i].end());
        long long sum = 0;
        for (int j = 0; j < n; j++) {
            if (j < n / 2) {
                sum -= a[i][j];
            } else {
                sum += a[i][j];
            }
        }
        ret += sum;
    }
    return ret;
}

long long find_maximum(int k, vector<vector<int>> x) {
    int n = x.size();
    int m = x[0].size();
    vector<int> id(n);
    iota(id.begin(), id.end(), 0);
    sort(id.begin(), id.end(), [&](int i, int j) {
        if (x[i][m - 1] == x[j][m - 1]) {
            return x[i][0] > x[j][0];
        }
        return x[i][m - 1] > x[j][m - 1];
    });
    vector<vector<int>> g(n, vector<int>(m, -1));
    for (int i = 0; i < n; i++) {
        if (i < n / 2) {
            g[id[i]][m - 1] = 0;
        } else {
            g[id[i]][0] = 0;
        }
    }
    long long ret = get(k, x, g);
    auto ans = g;
    sort(id.begin(), id.end(), [&](int i, int j) {
        if (x[i][m - 1] == x[j][m - 1]) {
            return x[i][m - 1] < x[j][m - 1];
        }
        return x[i][0] < x[j][0];
    });
    g.assign(n, vector<int>(m, -1));
    for (int i = 0; i < n; i++) {
        if (i < n / 2) {
            g[id[i]][0] = 0;
        } else {
            g[id[i]][m - 1] = 0;
        }
    }
    if (get(k, x, g) > ret) {
        ret = get(k, x, g);
        ans = g;
    }
    allocate_tickets(ans);
    return ret;
}

• 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