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.
"Look and say" sequence
Piecewise linear interpolation
Multiples of a Number in a Given Range
Flip the vector from right to left
Most Frequent Word - 01
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