May be I am wrong. But, are test 7 and 8 correct?
Looks like 7 and 8 should use fit(x), not fit(x,y).
Sorry for that. Fixed now.
Every test is correct. The problem with the circle packing algorithm is precision. Set the precision wrongly and we will miss a lot of circles (It was fun to revisit this kind of problem). And btw, the upper bound for circle packing in the plane is pi/sqrt(12) of the total area. Ignore the spheres in the question, it's a circle packing problem ("easy" version, since we already have the radii).
Maximum running product for a string of numbers
radius of a spherical planet
Reverse the vector
Back to basics 7 - Equal NaNs
String substitution, sub problem to cryptoMath
expand intervals vol.2
(Linear) Recurrence Equations - Generalised Fibonacci-like sequences
Calculate the Damerau-Levenshtein distance between two strings.
Optimum Egyptian Fractions
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