Submission #955041

#	Time	Username	Problem	Language	Result	Execution time	Memory
955041		Trisanu_Das	Carnival Tickets (IOI20_tickets)	C++17	76 / 100	2870 ms	225968 KiB

tickets

#include <bits/stdc++.h>
#include "tickets.h"
#include <vector>
 
using namespace std;
 
int n;
int m;
long long res = 0;
vector<int> l, r;
vector<vector<int>> sg, ans;
set<pair<int, pair<int, int>>> prio;
 
long long find_maximum(int k, vector<vector<int>> x) {
	n = x.size();
	m = x[0].size();
	l.resize(n, 0);
	r.resize(n, m - 1);
	sg.resize(n, vector<int>(m, 0));
	ans.resize(n, vector<int>(m, -1));
	for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < k; j++)
        {
            sg[i][j] = -1;
            int s, p;
            s = x[i][j];
            p = x[i][m - k + j];
            prio.insert(make_pair(-s - p, make_pair(i, j)));
            res -= s;
        }
    }
    int cnt = 0;
    for (auto it = prio.begin(); cnt < n * k / 2; cnt++, it++)
    {
        auto v = *it;
        res -= v.first;
        auto pos = v.second;
        sg[pos.first][pos.second] = 0;
        sg[pos.first][m - k + pos.second] = 1;
    }
    for (int t = 0; t < k; t++) {
        int plus = 0;
        for (int i = 0; i < n; i++) if (sg[i][l[i]] != -1) plus++;
        for (int i = 0; i < n; i++) {
            if (sg[i][l[i]] != -1) {
                ans[i][r[i]] = t;
                r[i]--;
            }else if (sg[i][r[i]] != 1){
                ans[i][l[i]] = t;
                l[i]++;
            } else {
                if (plus < n / 2) {
                    plus++;
                    ans[i][r[i]] = t;
                    r[i]--;
                } else{
                    ans[i][l[i]] = t;
                    l[i]++;
                }
            }
        }
    }
    allocate_tickets(ans);
	return res;
}

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