https://onlinegdb.com/BkG-qE9VD

#1

plz check and tell for what test cases is my code failing and what is wrong in logiic.

#2

From next time, please share the link in content, so that it is easier to click.

It’s okay for now. (I’ll see and reply)

#3 
	for(int i=0;i<n;i++)
	{
		a[i]=a[i+1]-a[i];
	}

loop should only run till n - 1.