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.
Project Euler: Problem 9, Pythagorean numbers
"Low : High - Low : High - Turn around " -- Create a subindices vector
Make a run-length companion vector
Numbers spiral diagonals (Part 1)
Divisible by 7
ZigZag - 01
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