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A solution to problem 5 on https://blog.svpino.com/2015/05/07/five-programming-problems-every-software-engineer-should-be-able-to-solve-in-less-than-1-hour
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| def find_100s(digits, i=0) | |
| if i == digits.length - 1 | |
| eval(digits) == 100 ? [digits] : [] | |
| else | |
| [find_100s(digits[0..i] + "+" + digits[i+1..-1], i+2), find_100s(digits[0..i] + "-" + digits[i+1..-1], i+2), find_100s(digits, i+1)] | |
| end | |
| end | |
| puts find_100s("123456789") |
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