Submission #572834

#	Time	Username	Problem	Language	Result	Execution time	Memory
572834		kartel	Carnival Tickets (IOI20_tickets)	C++14	27 / 100	491 ms	51352 KiB

tickets

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
//#include "grader.cpp"
#include "tickets.h"
#define sz(x) (int)x.size()
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define F first
#define S second
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;

typedef tree<pair <int, int> , null_type, less<pair <int, int> >, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

long long find_maximum(int k, vector <vector <int> > x) {
    int n = sz(x);
    int m = sz(x[0]);

    vector <vector <int> > ans(n, vector <int> (m, -1));
    vector <int> le(n, 0);
    vector <int> ri(n, m - 1);
    vector <int> M(n);
    vector <vector <int> > used(k, vector <int> (n, 0));
    ll sum = 0;
    for (int it = 0; it < k; it++) {
        vector <pair<int, int> > val;
        for (int i = 0; i < n; i++) {
            val.pb({x[i][le[i]] + x[i][m - k + it], i});
        }
        sort(all(val));
        for (int i = 0; i < n / 2; i++) {
            ans[val[i].S][le[val[i].S]] = it;
            used[it][val[i].S] = 1;
            sum -= x[val[i].S][le[val[i].S]];
            le[val[i].S]++;
        }
        M[it] = x[val[n / 2 - 1].S][le[val[n / 2 - 1].S]];
    }

    for (int it = 0; it < k; it++) {
        for (int i = 0; i < n; i++) {
            if (used[it][i]) {
                continue;
            }
            while (ri[i] >= 0 && ans[i][ri[i]] != -1) {
                ri[i]--;
            }
            assert(ri[i] != -1 && x[i][ri[i]] >= M[it]);
            used[it][i] = 1;
            ans[i][ri[i]] = it;
            sum += x[i][ri[i]];
        }
    }
    allocate_tickets(ans);
    return sum;
}

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