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- -module(ms).
- -export([score/1]).
- index(XS) -> [{I,X}||{I,X}<-lists:zip(lists:seq(1,length(XS)),XS)].
- score(Field) ->
- Rows=string:tokens(Field,"\n"),N=length(Rows),
- [FirstRow|_]=Rows,M=length(FirstRow),
- Vectors=
- [{-1,-1},{0,-1},{ 1,-1},
- {-1, 0}, { 1, 0},
- {-1, 1},{0, 1},{ 1, 1}],
- At=fun(X,Y) -> Row=lists:nth(Y,Rows), lists:nth(X,Row) end,
- Count=fun(FX,FY)->
- Coords=[{FX+DX,FY+DY}||{DX,DY}<-Vectors],
- Neighbours=[At(X,Y)||{X,Y}<-Coords,X>=1,Y>=1,X=<M,Y=<N],
- Mines=[C||C<-Neighbours,C =:= $*],
- length(Mines) end,
- ScoreRows=
- [[if
- C =:= $* -> $*;
- C =/= $* -> $0 + Count(X,Y)
- end
- ||{X,C}<-index(Row)]
- ||{Y,Row}<-index(Rows)],
- string:join(ScoreRows,"\n").
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