Submission #427728

#	Time	Username	Problem	Language	Result	Execution time	Memory
427728		zoooma13	Carnival Tickets (IOI20_tickets)	C++14	100 / 100	859 ms	91544 KiB

tickets

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

int n ,m ,k;
vector <vector <int>> x;

vector <vector <int>> construct(vector <int> pref){
    vector <array <int ,3>> fh[n] ,sh;
    for(int i = 0; i < n; i++){
        for(int j = 0; j < pref[i]; j++)
            fh[i].push_back({x[i][j] ,i ,j});
        for(int j = m-1; j >= m - (k-pref[i]); j--)
            sh.push_back({x[i][j] ,i ,j});
    }
	vector<vector<int>> answer(n ,vector<int>(m ,-1));
    vector<bitset<1500>> taken(n);
    for(auto&bs : taken) bs.set();
    int round_number = 0;
    for(int i = 0; i < n; i++)
    for(auto&c : fh[i]){
        answer[c[1]][c[2]] = round_number;
        taken[c[1]][round_number] = false;
        round_number = (round_number+1 == k? 0 : round_number+1);
    }
    vector <int> pos(n ,-1);
    for(auto&c : sh){
        pos[c[1]] = taken[c[1]]._Find_next(pos[c[1]]);
        answer[c[1]][c[2]] = pos[c[1]];
    }
    return answer;
}

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

    vector <int> pref(n ,k);
    priority_queue <pair <int64_t ,int>> pq;

    int64_t tot = 0;
    for(int i = 0; i < n; i++){
        for(int j = 0; j < pref[i]; j++)
            tot -= x[i][j];
        pq.push({x[i][pref[i]-1] + x[i][m-1-(k - pref[i])] ,i});
    }
    for(int step = 0; step < n*k/2; step++){
        auto p = pq.top(); pq.pop();
        tot += p.first;
        int i = p.second;
        pref[i]--;
        if(pref[i])
            pq.push({x[i][pref[i]-1] + x[i][m-1-(k - pref[i])] ,i});
    }

    allocate_tickets(construct(pref));
    return tot;
}

• 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