Que 1

#include<iostream>
#include <sstream>
#include <fstream>
#include <string>
#include <cstdlib>
#include <vector>

using namespace std;

class interval{
public:
  int *st;
  int *en;
  
  public:
  interval(int *start,int *end){
    st = start;
    en =end;
  }
};
int main()
{
  //Basic file handling:
  ifstream fin;
  string name;
  cout<<"Enter name of file = ";
  cin>>name;
  fin.open(name);

  string line; // making a string using inbuilt class string

  int count =0;
  int i=0;

  vector<string> a;  //making a vector by using vector class

//values are put in a from the file
  while(getline(fin, line))
    {
       a.push_back(line);
       i++;
       count++;
    }

  string arr[3][count]; //making another string array to store breaked string values

//braking the string using sstream class:
  for(i=0;i<count;i++)
  {
    int j=0;

    stringstream ssin(a[i]);

    while(ssin.good() && j<3)
    {
      ssin>>arr[j][i];
      ++j;
    }
  }

  int cou[count],ar[3][count];

//converting string into int using stoi() function and storing it in another array ar
  for(i=0;i<count;i++)
  {
    ar[0][i]=0;
    ar[1][i]=stoi(arr[1][i]);
    ar[2][i]=stoi(arr[2][i]);
    ar[2][i]=ar[1][i]+ ar[2][i];
  }

  int *star = ar[1];
  int *en = ar[2];
  
  for(i=0;i<count;i++)
	{		
		for(int j=i+1;j<count;j++)
		{
			if(arr[i]>arr[j])
			{
				int temp  =en[i];
				en[i]=en[j];
				en[j]=temp;
			}
		}
	}
  int res=0;
  int prevEnd = en[0];
  
  for(interval i(star,en))
  {
    if(*i.st >= prevEnd){
      res++;
      prevEnd = *i.en;
  }
    
    cout<<res<<endl;
  }
  
   for(i=0;i<count;i++)
   {
      cou[i]=0;

     for(int j=0;j<count;j++)
     {
       if((ar[1][j]>=ar[1][i]&&ar[1][j]<ar[2][i])||(ar[2][j]>ar[1][i]&&ar[2][j]<=ar[2][i]));
         cou[i]+=1;
         
     }
   }

  fin.close();
}