Given a decimal number, convert it to its corresponding Gray code (see https://en.wikipedia.org/wiki/Gray_code).
8 -- 1100
4 -- 110
17 -- 11001
Find state names that start with the letter N
Increment a number, given its digits
The Tower of Hanoi
Basics: counting digits of a number irrespective of the sign
An n-sided regular polygon is drawn within a circle whose radius is 'r', what will be the area of the polygon?
Tell your secret
Game of life - 02
Rotate a matrix without using rot90
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