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My homework is implementing algorithms BFS, DFS, depth-limited and IDS for the map as a 2D grid with 8 directions of movement. I read that the IDS algorithm is optimal, but in my case is not optimal paths.

Is the IDS algorithm optimal for graphs (e.g. map as a grid), or does optimality only apply to searching trees?

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migrated from stackoverflow.com Sep 24 '12 at 18:39

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  • $\begingroup$ IDS should be optimal if it's a simple grid traversal where the traveling cost is the same everywhere (see Wikipedia). Maybe check your implementation? $\endgroup$ – irrelephant Jul 29 '12 at 9:47

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