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| require 'mathn' | |
| car, *cdr = (1..9).map{|i| ['', '+', '-', '*', '/'].map { |o| o + i.to_s }} | |
| exps = car.product(*cdr).map {|exp| exp.join}.delete_if{|e| e =~ /^[\+|\*|\/]/} | |
| komachies = exps.select{|e| eval(e) == 100} | |
| komachies.each {|k| puts k} | |
| puts "#{komachies.count} / #{exps.count}" |
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