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just3ws/1089.rb

Created May 18, 2012 12:35
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1089
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1089.rb
# 1) Take any 3 digit number, But the first and third number Cannot be the same.
# 2) reverse the order and subtract
# 3) reverse the answer and then add it
"1234567890"
.split(//)
.map {|i| i.to_i }
.permutation(3)
.to_a
.map {|n| [n, n.reverse] }
.map {|x| [x.first.join, x.last.join].sort.reverse.reduce {|y,z| y.to_i - z.to_i } }
.map {|x| [x, x.to_s.reverse.to_i].reduce {|y,z| y + z } }
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just3ws commented May 18, 2012

Some return 198, not sure why.

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