Attending Workshops C++


Problem Statement :


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:
        The workshop's start time.
        The workshop's duration.
        The workshop's end time.

    2 . struct Available_Workshops having the following members:
        An integer, n (the number of workshops the student signed up for).
An array of type Workshop array having size n.

Implement  2 functions:

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_time[] 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:

DataType* arrayName = new DataType[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_time(i) <= 10^3
  0  <= duration(i)   <= 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.


Solution :



title-img 


                            Solution in C :

struct Workshop {
	int start_time, duration, end_time;
	bool operator<(const Workshop& another) const {
		return end_time < another.end_time;
	}
};

struct Available_Workshops {
	int N;
	vector<Workshop> arr;
};

Available_Workshops* initialize(int start_time[], int duration[], int N) {
	Available_Workshops* workshop = new Available_Workshops;
	workshop->N = N;
	for (int i = 0; i < N; i++) {
		Workshop temp;
		temp.start_time = start_time[i];
		temp.duration = duration[i];
		temp.end_time = start_time[i] + duration[i];
		workshop->arr.push_back(temp);
	}
	return workshop;
}

int CalculateMaxWorkshops(Available_Workshops* ptr) {
	int res = 0;
	sort(ptr->arr.begin(), ptr->arr.end());
	int end_time = -1;
	for (int i = 0; i < ptr->N; i++) {
		if (ptr->arr[i].start_time >= end_time) {
			res++;
			end_time = ptr->arr[i].end_time;
		}
	}
	return res;
}








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