Given the vector A, return B in which all numbers in A are doubling. So for:
A = [ 1 5 8 ]
B = [ 1 1 5 5 8 8 ]
Find state names that end with the letter A
Given an unsigned integer x, find the largest y by rearranging the bits in x
Wrapping the Tower of Pisa
Calculate the derivative of a polynomial
Solving a quadratic equation
Divisors of an integer
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