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).
Find the two most distant points
Angle of triangle
Scoring for oriented dominoes
Matrix indexing with two vectors of indices
Generate Square Wave
(Linear) Recurrence Equations - Generalised Fibonacci-like sequences
Don't Try, give up and return NaN.
Modify subscripts - easier
Cut an orange
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