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 ]
Extract leading non-zero digit
given 3 sides, find area of this triangle
Project Euler: Problem 2, Sum of even Fibonacci
Generate a string like abbcccddddeeeee
Is this triangle right-angled?
Divisors of an integer
Solving a quadratic equation
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