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!
Replace NaNs with the number that appears to its left in the row.
Sum the Digits of a Number
Area of a circle
Pointwise multiplication of vectors.
Calculate the sum of elements of n*n Hilbert matrix.
Count given word x in text.
Calculate roots of polynomial given as vector array.
For given xx,x, y vectors build spline of x and y and find yy values for xx vector.
Divide polynomial p1 by p2.
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