<algorithm> A graph search algorithm. A* is guaranteed to find a minimal
solution path before any other solution paths, if a solution exists, in other
words, it is an "admissible" search algorithm. Each path is assigned a value
based on the cost of the path (e.g. its length) and an (under)estimate of the
cost of completing the path, i.e. the cost of a path from the end of the current
path to a solution.
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