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llasram/p083.ijs

Last active August 29, 2015 14:23
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J implementation of Dijkstra's algorithm on a square grid (Project Euler #83)
Raw
p083.ijs
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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