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).
Back and Forth Rows
Given two strings, find the maximum overlap
Stuff the Board
Replicate elements in vectors
Reverse the elements of an array
Pernicious Anniversary Problem
Pancakes for everyone!
How many solutions has this problem?
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