Submission #609629

#	Time	Username	Problem	Language	Result	Execution time	Memory
609629		Jarif_Rahman	Carnival Tickets (IOI20_tickets)	C++17	100 / 100	688 ms	56576 KiB

tickets

#include "tickets.h"
#include <bits/stdc++.h>
#define pb push_back
#define f first
#define sc second
using namespace std;
typedef long long int ll;
typedef string str;

ll find_maximum(int K, vector<vector<int>> v){
    int n = v.size(), m = v[0].size();
    vector<vector<int>> pos(n, vector<int>(m, -1));

    ll ans = 0;
    vector<vector<bool>> plus(n, vector<bool>(m, 0));

    for(int i = 0; i < n; i++) for(int j = m-1; j >= m-K; j--) ans+=v[i][j], plus[i][j] = 1;

    priority_queue<pair<ll, pair<int, int>>> pq;

    for(int i = 0; i < n; i++) pq.push({-v[i][0]-v[i][m-K], {i, 0}});

    for(int I = 0; I < (n*K)/2; I++){
        auto [x, ij] = pq.top(); pq.pop();
        auto [i, j] = ij;
        plus[i][m-K+j] = 0;
        ans+=x;
        if(j != K-1) pq.push({-v[i][j+1]-v[i][m-K+j+1], {i, j+1}});
    }

    vector<int> cnt(n), o(n);
    for(int i = 0; i < n; i++) cnt[i] = count(plus[i].begin(), plus[i].end(), 1);
    for(int i = 0; i < n; i++) o[i] = i;

    vector<int> L(n, 0), R(n, m-1);

    for(int k = 0; k < K; k++){
        sort(o.begin(), o.end(), [&cnt](int a, int b){
            return cnt[a] < cnt[b];
        });

        for(int j = 0, i = o[0]; j < n/2; j++, i = o[j]){
            pos[i][L[i]] = k;
            if(plus[i][L[i]]) cnt[i]--;
            L[i]++;
        }
        for(int j = n/2, i = o[n/2]; j < n; j++, i = o[j]){
            pos[i][R[i]] = k;
            if(plus[i][R[i]]) cnt[i]--;
            R[i]--;
        }
    }

    allocate_tickets(pos);

    return ans;
}

• 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