Attending Workshops in C++ – Hacker Rank Solution | HackerRank Programming Solutions | HackerRank C++ Solutions

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C++ Prorgramming Solutions

Hello Programmers/Coders, Today we are going to share solutions of Programming problems of HackerRank of Programming Language C++ . At Each Problem with Successful submission with all Test Cases Passed, you will get an score or marks. And after solving maximum problems, you will be getting stars. This will highlight you profile to the recruiters.

In this post, you will find the solution for Attending Workshops in C++-HackerRank Problem. We are providing the correct and tested solutions of coding problems present on HackerRank. If you are not able to solve any problem, then you can take help from our Blog/website.

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Introduction To C++

C++ is a general-purpose programming language that was developed as an enhancement of the C language to include object-oriented paradigm. It is an imperative and a compiled language. 

C++ is a middle-level language rendering it the advantage of programming low-level (drivers, kernels) and even higher-level applications (games, GUI, desktop apps etc.). The basic syntax and code structure of both C and C++ are the same. 

C++ programming language was developed in 1980 by Bjarne Stroustrup at bell laboratories of AT&T (American Telephone & Telegraph), located in U.S.A. Bjarne Stroustrup is known as the founder of C++ language.

Attending Workshops in C++ - Hackerrank Solution

Objective

A student signed up for n workshops and wants to attend the maximum number of workshops where no two workshops overlap. You must do the following:

Implement 2 structures:
1. struct Workshop having the following members:
        1. The workshop’s start time.
        2. The workshop’s duration.
        3. The workshop’s end time.
2. struct Available_Workshops having the following members:
        1. An integer, n (the number of workshops the student signed up for).
        2. An array of type Workshop array having size n.

Implement 2functions:

  1. Available_Workshops* initialize (int start_time[], int duration[], int n) Creates an Available_Workshops object and initializes its elements using the elements in the start_timr[] and duration[] parameters (both are of size n). Here, start_time[i] and duration[i] are the respective start time and duration for the ith workshop. This function must return a pointer to an Available_Workshops object.
  2. int CalculateMaxWorkshops(Available_Workshops* ptr) Returns the maximum number of workshops the student can attend—without overlap. The next workshop cannot be attended until the previous workshop ends.

Note: An array of unknown size (n) should be declared as follows

Input Format :

Input from stdin is handled by the locked code in the editor; you simply need to write your functions to meet the specifications of the problem statement above.

Constraints :

  • 1<= N <= 10^5
  • 0 <= start_timei <= 10^3
  • 0 <= durationi <= 10^3

Output Format :

Output to stdout is handled for you.
Your initialize function must return a pointer to an Available_Workshops object.
Your CalculateMaxWorkshops function must return maximum number of non-overlapping workshops the student can attend.

Sample Input :

6
1 3 0 5 5 8
1 1 6 2 4 1

Sample Output :

CalculateMaxWorkshops should return 4.

Explanation :

The first line denotes n, the number of workshops.
The next line contains n space-separated integers where the ith integer is the ith workshop’s start time.
The next line contains n space-separated integers where the ith integer is the ith workshop’s duration.
The student can attend the workshops 0,1,3 and 5 without overlap, so CalculateMaxWorkshops returns 4 to main (which then prints 4 to stdout)

Attending Workshops in C++ – Hacker Rank Solution.
#include<bits/stdc++.h>

using namespace std;

//Define the structs Workshops and Available_Workshops.
//Implement the functions initialize and CalculateMaxWorkshops
/* Attending Workshops in C++ - Hacker Rank Solution START */
#include <vector>
#include <iostream>

typedef pair<int,int> p;
typedef vector<p> Available_Workshops;

Available_Workshops* initialize(int *start_time, int *duration, int n) {
    auto aw = new Available_Workshops(n);
    for(int i = 0; i < n; i++){
        aw->at(i).first = start_time[i];
        aw->at(i).second = start_time[i]+duration[i];
    }
    return aw;
}

int CalculateMaxWorkshops(Available_Workshops* data) {
    sort(data->begin(),data->end(), [](const p &a, const p &b) { return a.second < b.second; });
    int f = 0, res = 0;
    for(int i = 0; i < data->size(); i++){
        if(data->at(i).first >= f){
            res++;
            f = data->at(i).second;
        }
    }
    return res;
}
/* Attending Workshops in C++ - Hacker Rank Solution END */

int main(int argc, char *argv[]) 
{
    int n; // number of workshops
    cin >> n;
    // create arrays of unknown size n
    int* start_time = new int[n];
    int* duration = new int[n];

    for(int i=0; i < n; i++)
    {
        cin >> start_time[i];
    }
    for(int i = 0; i < n; i++)
    {
        cin >> duration[i];
    }

    Available_Workshops * ptr;
    ptr = initialize(start_time,duration, n);
    cout << CalculateMaxWorkshops(ptr) << endl;
    return 0;
}

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