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四則演算を組み合わせて100なる組み合わせを抽出するプログラム
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# 左から計算できるものしか抽出できない | |
## 実行例 | |
# ruby sample.rb 1 2 8 8 8 | |
# ((((1) + 8) / 2) + 8) * 8 | |
# ((((8) + 1) / 2) + 8) * 8 | |
require 'rational' | |
numbers = ARGV.map(&:to_r) | |
operators = ["+", "-", "*", "/"] | |
possible_operator_combination = operators.product(*([operators]*(numbers.size-2))) | |
numbers.permutation(numbers.size).to_a.uniq.each do |target| | |
possible_operator_combination.each do |ops| | |
if 100 == target[1..-1].each_with_index.inject(target[0]){ |res, (v, i)| res.send(ops[i], v) } | |
puts "(" * (target.size-1) + target.map(&:to_i).zip(ops.map{ |e| ") #{e} " }).flatten.join("") | |
end | |
end | |
end |
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