Submission #607498

#	Time	Username	Problem	Language	Result	Execution time	Memory
607498		Jarif_Rahman	Carnival Tickets (IOI20_tickets)	C++17	25 / 100	992 ms	84396 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));

    vector<pair<int, int>> sth;
    for(int i = 0; i < n; i++) for(int j = 0; j < m; j++) sth.pb({i, j});
    sort(sth.begin(), sth.end(), [&](pair<int, int> a, pair<int, int> b){
        if(v[a.f][a.sc] == v[b.f][b.sc]) return make_pair(a.sc, a.f) > make_pair(b.sc, b.f);
        return v[a.f][a.sc] > v[b.f][b.sc];
    });

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

    for(int i = 0; i < (n*m)/2; i++) cnt[sth[i].f]++, plus[sth[i].f][sth[i].sc] = 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]--;
            ans-=v[i][L[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]--;
            ans+=v[i][R[i]];
            R[i]--;
        }
    }

    allocate_tickets(pos);

    return ans;
}

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