maybe not the most elegant, but it work!
def expression_matter(a,b,c) sum = [a,b,c].sum tmp = [a,b,c].inject('*') sum = tmp if sum < tmp tmp = (a + b) * c sum = tmp if sum < tmp tmp = a + (b * c) sum = tmp if sum < tmp tmp = a * (b + c) sum = tmp if sum < tmp tmp = (a + c ) * b sum = tmp if sum < tmp sum end
pry(main)> expression_matter(5, 1, 3) => 20 pry(main)> expression_matter(3, 5, 7) => 105 pry(main)> expression_matter(5, 6, 1) => 36 pry(main)> expression_matter(1, 6, 1) => 12 pry(main)> expression_matter(2, 6, 1) => 18
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maybe not the most elegant, but it work!