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Project Euler 18.

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Find the maximum total from top to bottom of the triangle below:

Ruby:

triangle =
  "75
   95 64
   17 47 82
   18 35 87 10
   20 04 82 47 65
   19 01 23 75 03 34
   88 02 77 73 07 63 67
   99 65 04 28 06 16 70 92
   41 41 26 56 83 40 80 70 33
   41 48 72 33 47 32 37 16 94 29
   53 71 44 65 25 43 91 52 97 51 14
   70 11 33 28 77 73 17 78 39 68 17 57
   91 71 52 38 17 14 91 43 58 50 27 29 48
   63 66 04 68 89 53 67 30 73 16 69 87 40 31
   04 62 98 27 23 09 70 98 73 93 38 53 60 04 23".
  each_line.map{|line| line.scan( /\d+/ ).map &:to_i}

$max_total = 0
def maximize( sum, column, delta, (row,*rest) )
  if !row
    $max_total = [$max_total, sum].max
  else
    column.upto(column + delta){|i| maximize(sum + row[i], i, 1, rest)}
  end
end
maximize(0,0,0,triangle)
$max_total

 ===>
1074

In Forth?


-- 
Use this [sword] for me, if I rule well; if not, against me. --- Trajan
"If a government uses the instruments of power in its hands for the purpose of
leading a people to ruin, then rebellion is not only the right but also the
duty of every individual citizen."

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Project Euler 18. "Robert L." <No_spamming@noWhere_7073.org> - 2017-01-12 06:21 +0000
  Re: Project Euler 18. Melzzzzz <mel@zzzzz.com> - 2017-01-12 11:14 +0100

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