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J implementation of Dijkstra's algorithm on a square grid (Project Euler #83)
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| mask =: _~:] | |
| moves =: 1 :'(0 1, 0 _1, 1 0,: _1 0) |.!.m"1 2 ]' | |
| step =: [:<./ ], (* +./@:(0 moves)@:mask) +"2 (_ moves)@:] | |
| init =: * $ $!._ 1: | |
| costs =: step^:_ init | |
| M =: ([:".(;._1)',',])(;._1)_1|.(1!:1)<'p083_matrix.txt' | |
| ] p83 =: {:{: costs M |
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