1.write code that remove spaces from string and split it by ',' to array in O(n)
2.why the destructor should be Virtual (ans : to clean all the memory we created by sub class)
3.design 2 options of undo function for drawing page
(ans : 1. faster but use more space - save each time the whole screen
2. less space but slower - save each time the last metadata of ecah object)
4.some probelm about not having copy cunstructor
(use the default one - cause problem sometime - not allocate memory as we tought and might crash).
5.Factory pattern design. change from many "if" to factory design.
(ans : Factory design and each time just add to dictionary and dont need to cahnge code)

Question

1.write code that remove spaces from string and split it by ',' to array in O(n)
2.why the destructor should be Virtual (ans : to clean all the memory we created by sub class)
3.design 2 options of undo function for drawing page
	(ans : 1. faster but use more space - save each time the whole screen	
	2. less space but slower - save each time the last metadata of ecah object)
4.some probelm about not having copy cunstructor
	(use the default one - cause problem sometime - not allocate memory as we tought and might crash).
5.Factory pattern design. change from many "if" to factory design.
	(ans : Factory design and each time just add to dictionary and dont need to cahnge code)

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