Note that this problem uses the word solve when it needs to say EVALUATE.
Also the required code to pass the tests shouldn't be available by COPY-AND-PASTE from Test Suite!
Times 2 - START HERE
Most nonzero elements in row
Check if number exists in vector
Do Fast Fourier Transformation
Product of Array
Pointwise multiplication of vectors.
Opposite task convert string hexadecimal numbers array into array of decimal numbers .
Replace x value into y value in string text.
Convert array of decimal numbers into binary numbers array.
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