Find 2 elements in an array such that their sum is equal to a given number. o(nlogn)

#include<iostream.h>

#include<conio.h>

void main()

{

      clrscr();

      int n,val,i,j;

      int array[]={10,20,30,40,50,60,70,80};

      n=8;

      cout<<" \n\nEnter the value :";

      cin>>val;

      int flag=0;

      i=0,j=n-1;

      while(i<j)

      {

            if(array[i]+array[j]==val)

            {

                  cout<<"\n"<<array[i]<<" + "<<array[j]<<" = "<<val;

                  flag=1;

                  i++;

                  j--;

            }

            else if(array[i]+array[j]>val)

                  j--;

            else

                  i++;

      }

      if(flag==0)

                  cout<<"\nNo such elements";

      getch();

}