Fencepost-problem meaning

(computing) In computer programming, a problem dealing with how to treat the initial or boundary values of a discrete problem.
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Origin of fencepost-problem

By analogy with fence-building. If one wants to say "lay a fencepost, then a length of fence, then repeat", then a special case must be made for the final fencepost. If one wants to say "lay a length of fence, then a fencepost, then repeat", then a special case must be made for the initial fencepost.