Submission #622824

#	Time	Username	Problem	Language	Result	Execution time	Memory
622824		someone	Carnival Tickets (IOI20_tickets)	C++14	100 / 100	858 ms	97048 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) {
    ll n = x.size(), m = x[0].size(),
       sum = 0, need = k*n/2, id[n];

    int chosen[n][m];
    for(int i = 0; i < n; i++)
        for(int j = 0; j < m; j++)
            chosen[i][j] = 0;
    vector<vector<int>> s(n);
    priority_queue<pair<ll, ll>> change;
    for(int i = 0; i < n; i++) {
        id[i] = m-k;
        s[i].resize(m);
        sort(x[i].begin(), x[i].end());
        for(int j = 0; j < m; j++)
            s[i][j] = -1;
        for(int j = id[i]; j < m; j++) {
            sum += x[i][j];
            chosen[i][j] = 1;
        }
        change.push({- x[i][0] - x[i][m-k], i});
    }
    while(need--) {
        pair<ll, ll> pii = change.top();
        change.pop();
        sum += pii.first;
        ll lig = pii.second, rempl = id[lig] - (m-k);

        chosen[lig][rempl] = -1;
        if(rempl != id[lig])
            chosen[lig][id[lig]] = 0;

        id[lig]++;
        if(id[lig] < m)
            change.push({- x[lig][id[lig] - (m-k)] - x[lig][id[lig]], lig});
    }
    vector<int> inf[n], sup[n];
    for(int i = 0; i < n; i++)
        for(int j = 0; j < m; j++)
            if(chosen[i][j] == 1)
                sup[i].push_back(j);
            else if(chosen[i][j] == -1)
                inf[i].push_back(j);
    int mid = n/2;
    for(int i = 0; i < k; i++) {
        pair<int, int> iLig[n];
        for(int j = 0; j < n; j++)
            iLig[j] = {sup[j].size(), j};
        sort(iLig, iLig + n);
        for(int j = 0; j < mid; j++) {
            int lig = iLig[j].second;
            s[lig][inf[lig].back()] = i;
            inf[lig].pop_back();
        }
        for(int j = mid; j < n; j++) {
            int lig = iLig[j].second;
            s[lig][sup[lig].back()] = i;
            sup[lig].pop_back();
        }
    }
    allocate_tickets(s);
    return sum;
}

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