Src: http://www.palantir.com/2011/10/how-to-rock-a-systems-design-interview/
https://hackernoon.com/design-to-shine-how-to-ace-your-next-system-design-interview-2282bbf45c40
Tree
Problem 1 :
In this problem, you will learn how to check whether a number entered by the user is positive or negative or zero. This problem is solved using nested if…else statement.