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.
Back to basics 21 - Matrix replicating
Whether the input is vector?
Find the sum of n squares
Linear system of equations
find nth even fibonacci number
Ugly numbers - 02
Last non-zero digit
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