Microsoft Question - MaxEmployeeAttendence (original question), C++ (gcc)

Language: Layout:

//g++  7.4.0
// https://leetcode.com/discuss/interview-experience/1930164/Microsoft-or-SDE2-or-Hyderabad-or-April-2022-Reject

#include <bits/stdc++.h>

using namespace std;

const int total_days = 10;
const int repititions = 2;

/*
 * availability[i] - list of days on which ith employee will be available to take the training. [0 <= availability[i][j] < D]
 *
 * total_days (D)  - total number of days in which the training can be conducted.
 *
 * repititions (R) - number of times the training will be repeated in 'total_days' duration.
 *
**/
int MaxEmployeeAttendence (vector<vector<int>>& availability) {
    vector<vector<int>> possible_attendants_at_day(total_days);
    
    for (int employee = 0; employee < availability.size(); employee ++) {
        for (int day : availability[employee]) {
            possible_attendants_at_day [day].push_back(employee);
        }
    }
    
    int max_attendence = 0;
    
    for (int day1 = 0; day1 < total_days; day1 ++) {
        for (int day2 = day1+1; day2 < total_days; day2 ++) {
            unordered_set<int> unique_employees;
            
            for (auto emp : possible_attendants_at_day[day1]) unique_employees.insert (emp);
            for (auto emp : possible_attendants_at_day[day2]) unique_employees.insert (emp);
            
            if (max_attendence < unique_employees.size()) max_attendence = unique_employees.size();
        }
    }
    
    return max_attendence;
}

int main() {
    vector<vector<int>> availability = {
        {0, 3, 9},
        {4},
        {1, 4},
        {3, 2},
        {3, 4},
        {7}
    };
    
    cout << MaxEmployeeAttendence (availability) << endl;
    return 0;
}

Show compiler warnings [ + ] Compiler args [ + ] Show input
Compilation time: 1.62 sec, absolute running time: 0.16 sec, cpu time: 0 sec, memory peak: 5 Mb, absolute service time: 1,89 sec