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 longest sequence of 1's in a binary sequence.
Replace NaNs with the number that appears to its left in the row.
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Create Volcano (or Atoll) martix. It is an extension of Bullseye matrix problem.
Pancake sorting - minimum flips.
(Linear) Recurrence Equations - Generalised Fibonacci-like sequences
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