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Proximity Grid

by MeWhenI , stefangimmillaro


A grid is a 9x9 square of characters representing an arrangement of points, some of which are walls, denoted by #'s, or sources, denoted by 0's; every other point is passible, denoted with -'s.

For a series of grids, compute the length of the shortest path connecting each passible point to a source. A path must move horizontally or vertically through the grid and cannot pass through walls. Output each grid with every passible point replaced by its distance to a source written in base62 (0-9 A-Z a-z); points which cannot be connected to a source should remain unchanged.

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