Created
June 19, 2015 19:49
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Quick and dirty solution for this puzzle http://gizmodo.com/can-you-solve-this-vietnamese-math-puzzle-for-8-year-ol-1705734738
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| formula = "%d.0 + 13 * %d.0 / %d.0 + %d.0 + 12 * %d.0 - %d.0 - 11 + %d.0 * %d.0 / %d.0 - 10" | |
| combinations = (1..9).to_a.permutation.map(&:join) | |
| combinations.each do |combination| | |
| expr = format(formula, *combination.split('')) | |
| result = eval(expr) | |
| puts expr.gsub(/\.0/, '') if result == 66.0 | |
| end |
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