Submission #930789

#	Time	Username	Problem	Language	Result	Execution time	Memory
930789		JooDdae	Carnival Tickets (IOI20_tickets)	C++17	25 / 100	890 ms	85756 KiB

tickets

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

ll find_maximum(int k, vector<vector<int>> x) {
    int n = x.size();
    int m = x[0].size();
    vector<vector<int>> answer;

    int N = n*m;
    vector<array<int, 2>> v;
    for(int i=0;i<n;i++) for(int j=0;j<m;j++) {
        v.push_back({x[i][j], i});
    }
    sort(v.begin(), v.end());

    ll ans = 0;
    vector<int> c(n, 0), L(n, 0);
    for(int i=0;i<N/2;i++) c[v[i][1]]++, ans += v[i+N/2][0] - v[i][0];
    vector<int> R = c;

    priority_queue<array<int, 2>> pq;
    for(int i=0;i<n;i++) pq.push({c[i], i});

    vector<vector<int>> re(n, vector<int>(m, -1));
    for(int i=0;i<m;i++) {
        set<int> s;
        for(int j=0;j<n/2;j++) s.insert(pq.top()[1]), pq.pop();

        for(int j=0;j<n;j++) {
            if(s.count(j)) re[j][L[j]++] = i;
            else re[j][R[j]++] = i;
        }

        for(auto x : s) pq.push({--c[x], x});
    }

    allocate_tickets(re);
    return ans;
}

• Subtask 1: 11 / 11
• Subtask 2: 0 / 16
• Subtask 3: 0 / 14
• Subtask 4: 14 / 14
• Subtask 5: 0 / 12
• Subtask 6: 0 / 23
• Subtask 7: 0 / 10