Created
September 17, 2016 08:51
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プログラマ脳を鍛える数学パズル:Q2 (別解)
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# -- 処理時間計測の自作ライブラリ -- | |
require './process_measure.rb' | |
# ------------------------------ | |
def print_enable_combinarion(from, to) | |
s = ['+', '-', '*', '/', ''] | |
(from..to).each do |num| | |
a = num.to_s.split("") | |
[a[0]].product(s, [a[1]], s, [a[2]], s, [a[3]]) do |c| | |
next if abort?(str = c.join) | |
puts num if eval(str).to_s == num.to_s.reverse | |
end | |
end | |
end | |
def abort?(str) | |
(str.size == 4) || (str =~ /[\+\-\*\/]0+[1-9]/) || (str =~ /\/0/) | |
end | |
measure_do { print_enable_combinarion(1000, 9999) } |
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