It would be good to add a test where the solution is not 5*a, which always happens when b = 2*a.
e.g. a=2, b=9, r=17; a=1, b=8, r=13; a=18, b=25, r=73; etc.
good one :)
The circle is inscribed in a square. And the rectangle touching the square corner intersects the circle at one vertex precisely. (This needs to be said: we can't trust our eyes.)
Make a simplified barcode
Determine Whether an array is empty
Return the first and last character of a string
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Which way to go?
Slicing the cube
Speed of light:Experiment
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