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This article + this HN thread have some nice tricks. I haven't needed A* for much (yet), but I do know there's a nice Haskell library for it https://hackage.haskell.org/package/astar-monad-0.3.0.0#read...


Apparently that's deprecated in favor of monad-dijkstra! https://hackage.haskell.org/package/monad-dijkstra




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