how do we know in problem 317B - Ants an array of a[147][147] will suffice?? thanks in advance
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It isn't; I find for n=30000 I need a 111x111 array. Except if you only consider the top-right quadrant or something (in which 56x56 suffices).
To figure it out? Probably emulating it for n=30000 is the fastest way, and also note that the bounding box won't get smaller wwith larger n so you're sure n=30000 is worst case.