Jim Burton wrote: > > > Ronald Guida wrote: >> >> Hi, again. >> >> I started looking at the Euler problems [1]. I had no trouble with >> problems 1 through 10, but I'm stuck on problem 11. I am aware that >> the solutions are available ([2]), but I would rather not look just >> yet. >> [...] >> >> > > FWIW I used a 2D array and a function to retrieve the values in every > direction from a given row,col, for each direction valid for that array > index. Getting the 4 vals in each direction is done by iterating 2 > functions on the (row,col) index to move in the right direction I.e., > > vals (row,col) = north : south : ... : [] > where north = if toohigh then [] else stream (subtract 1) (id) > south = if toolow then [] else stream (+1) (id) > ....... > > where `stream' is badly named -- rather than a stream it's the 4 vals in that direction.
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