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Quicksand
In this fastest-code challenge, you take a positive integer as input, which represents the height of a sand pile, located at (0,0) on an infinite square grid. For example, if our input is 123, the sand grid looks initially like this:
\$\begin{matrix}
0 & 0 & 0 \\
0 &123& 0 \\
0 & 0 & 0
...