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.
Angle between Two Vectors
Arrange vector in ascending order
Golomb's self-describing sequence (based on Euler 341)
Can the knight take out the pawn?
Sieve of Eratosthenes
generate the matrix
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