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.
Increment a number, given its digits
Project Euler: Problem 6, Natural numbers, squares and sums.
Scoring for oriented dominoes
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Maya long Count
3rd side of a Triangle
Connect Four - 02
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