The problem is asking for tangent circles.
Problem with the third test suite
in 3rd case,
they intersect at two points.
In geometry, tangent circles (also known as kissing circles) are circles that intersect in a single point.
Select every other element of a vector
Sorted highest to lowest?
Increment a number, given its digits
Maximum value in a matrix
multiply by three
find subscripts from linear index
Maya - 02
ZigZag - 01
Sky full of stars - 03
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