Submission #1238244

#	Time	Username	Problem	Language	Result	Execution time	Memory
1238244		SalihSahin	Carnival Tickets (IOI20_tickets)	C++20	62 / 100	1142 ms	2162688 KiB

tickets

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

const long long inf = 1e15;

long long find_maximum(int k, vector<vector<int>> x) {
    int n = x.size();
    int m = x[0].size();
    vector<vector<int>> ans(n, vector<int>(m, -1));
    vector<vector<long long> > add(n, vector<long long>(k+1));
    vector<int> ind(n);

    for(int i = 0; i < n; i++){
        vector<pair<int, int> > arr;
        for(int j = 0; j < m; j++){
            arr.pb({x[i][j], j});
        }
        sort(arr.begin(), arr.end());
        long long now = 0;
        for(int j = 0; j < k; j++){
            now -= arr[j].first;
        }
        add[i][0] = now;
        for(int j = 0; j < k; j++){
            now += arr[(k - j - 1)].first;
            now += arr[m - j - 1].first;
            add[i][j+1] = now;
        }
    }

    priority_queue<array<long long, 2> > pq;
    long long mval = 0;
    for(int i = 0; i < n; i++){
        mval += add[i][0];
        pq.push({add[i][ind[i]+1] - add[i][ind[i]], i});
    }

    for(int tur = 0; tur < n*k/2; tur++){
        int i = pq.top()[1];
        long long art = pq.top()[0];
        pq.pop();
        mval += art;
        ind[i]++;
        if(ind[i] != k){
            pq.push({add[i][ind[i]+1] - add[i][ind[i]], i});
        }
    }

    vector<vector<pair<int, int> > > par(n+1, vector<pair<int, int> >(n*k/2+2));
    pair<int, int> lst = {0, 0};
    for(int i = 0; i < n; i++){
        par[i+1][lst.second + ind[i]] = lst;
        lst = {i+1, lst.second + ind[i]};
    }

    
    int lstsm = 0, lstbg = k-1;
    pair<int, int> now = {n, n*k/2};
    while(now != make_pair(0, 0)){
        pair<int, int> nxt = par[now.first][now.second];
        int big = now.second - nxt.second;
        int small = k - big;

        vector<pair<int, int> > arr;
        for(int j = 0; j < m; j++){
            arr.pb({x[nxt.first][j], j});
        }
        sort(arr.begin(), arr.end());
        for(int i = 0; i < small; i++){
            ans[nxt.first][arr[i].second] = lstsm++;
            if(lstsm == k) lstsm -= k;
        }
        for(int i = m-1; i >= m-big; i--){
            ans[nxt.first][arr[i].second] = lstbg--;
            if(lstbg == -1) lstbg += k;
        }

        now = nxt;
    }

    allocate_tickets(ans);
    return mval;
}

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