I really like this contest, held at Wild About Math! every other Monday. Maybe because I won a prize the first time I entered. Or maybe because the first person I encouraged to try one of these got it, after just enough effort to make his victory sweet.
Background from #36 (part 1):
Background from #36 (part 1):
Imagine arranging the positive integers in a spiral pattern.
The numbers from 1 to 16 look like this in the spiral pattern.
10 9 8 7
11 2 1 6
12 3 4 5
13 14 15 16
The location of each number corresponds to an X,Y Cartesian coordinate where the number 1 is at the origin: (0,0). 2 is at (-1,0). 3 is at (-1,-1). 4 is at (0,-1). 5 is at (1,-1). 6 is at (1,0). 7 is at (1,1) and so on.
Here's this week's contest problem:- Come up with an algorithm that tells what number is at an arbitrary X, Y coordinate.
- Come up with an algorithm that tells the X, Y coordinates for an arbitrary positive integer.
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