Submission #419513

#	Time	Username	Problem	Language	Result	Execution time	Memory
419513		vkgainz	Carnival Tickets (IOI20_tickets)	C++17	11 / 100	2 ms	692 KiB

tickets

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

struct ins {
    int val, sidx, lidx, idx;
};

bool cmp(ins &x, ins &y) { 
    if(x.val == y.val) return x.idx < y.idx;
    return x.val < y.val;
}

void allocate_tickets(vector<vector<int>> s);

int64_t find_maximum(int k, vector<vector<int>> x) {
    int n = (int) x.size(), m = (int) x[0].size();
    int64_t ans = 0;
    vector<vector<int>> assign(n, vector<int>(m));
    for(int r = 0; r < k; r++) {
        vector<ins> in;
        for(int i = 0; i < n; i++) {
            int mn = -1, mx = -1;
            for(int j = 0; j < m; j++) {
                if(x[i][j] == -1) continue;
                if(mn == -1 || mx == -1)
                    mn = j, mx = j;
                if(x[i][j] < x[i][mn]) mn = j;
                if(x[i][j] > x[i][mx]) mx = j;
            }
            in.push_back({x[i][mn] + x[i][mx], mn, mx, i});
        }
        sort(in.begin(), in.end(), cmp);
        for(int i = 0; i < n; i++) {
            if(i < n / 2) {
                ans -= x[in[i].idx][in[i].sidx];
                x[in[i].idx][in[i].sidx] = -1;
                assign[in[i].idx][in[i].sidx] = r;
            }
            else {
                ans += x[in[i].idx][in[i].lidx];
                x[in[i].idx][in[i].lidx] = -1;
                assign[in[i].idx][in[i].lidx] = r;
            }
        }
    }
    allocate_tickets(assign);
    return ans;
}

• 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