patrick
7646fb71c3
Can't be bothered to get it faster Co-authored-by: Smaug123 <patrick+github@patrickstevens.co.uk> Reviewed-on: #19
31 lines
778 B
Mathematica
31 lines
778 B
Mathematica
(* ::Package:: *)
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(* ::Input:: *)
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(*s="...........*)
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(*.....###.#.*)
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(*.###.##..#.*)
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(*..#.#...#..*)
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(*....#.#....*)
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(*.##..S####.*)
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(*.##..#...#.*)
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(*.......##..*)
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(*.##.#.####.*)
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(*.##..##.##.*)
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(*...........";*)
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(* ::Input:: *)
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(*reachable[grid_,{row_Integer,col_Integer}]:=reachable[grid,{row,col}]=Select[{{row+1,col},{row-1,col},{row,col+1},{row,col-1}},*)
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(*1<=#[[1]]<=Length[grid]&&1<=#[[2]]<=Length[First@grid]&&grid[[#[[1]],#[[2]]]]!="#"&*)
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(*]*)
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(* ::Input:: *)
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(*f[grid_,pos_,0]:={pos}*)
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(*f[grid_,pos_,timestepsRemaining_Integer]:=*)
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(*f[grid,pos,timestepsRemaining]=DeleteDuplicates@Flatten[f[grid,#,timestepsRemaining-1]&/@reachable[grid,pos],1]*)
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(* ::Input:: *)
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(*With[{grid=Characters/@StringSplit[s,"\n"]},f[grid,FirstPosition[grid,"S"],64]//Length]*)
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