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).
Read a column of numbers and interpolate missing data
Return the first and last characters of a character array
Is the paranthesis sequence balanced ?
Find a Pythagorean triple
expand intervals vol.3
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Calculate the Damerau-Levenshtein distance between two strings.
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