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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 * 2*functions:

- Available_Workshops* initialize (int start_time[], int duration[], int n) Creates an Available_Workshops object and initializes its elements using the elements in the
and**start_timr[]**parameters (both are of size**duration[]**). Here,**n**and**start_time[i]**are the respective start time and duration for the ith workshop. This function must return a pointer to an Available_Workshops object.**duration[i]** - 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 (

*) should be declared as follows*

**n**#### 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 :

6130558116241

#### Sample Output :

CalculateMaxWorkshops should return * 4*.

#### Explanation :

The first line denotes * n*, the number of workshops.

The next line contains

*space-separated integers where the*

**n***integer is the*

**ith***workshop’s start time.*

**ith**The next line contains

*space-separated integers where the*

**n***integer is the*

**ith***workshop’s duration.*

**ith**The student can attend the workshops

*and*

**0,1,3***without overlap, so CalculateMaxWorkshops returns*

**5***to main (which then prints*

**4***to stdout)*

**4**.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; }