Created
December 25, 2010 02:20
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| N = 5 | |
| def permutations digits | |
| return [0, 1] if digits == 1 | |
| permutations(digits-1).map { |d| [0, d].flatten } + | |
| permutations(digits-1).reverse.map { |d| [1, d].flatten } | |
| end | |
| puts permutations(N).map &:join |
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| 00000 | |
| 00001 | |
| 00011 | |
| 00010 | |
| 00110 | |
| 00111 | |
| 00101 | |
| 00100 | |
| 01100 | |
| 01101 | |
| 01111 | |
| 01110 | |
| 01010 | |
| 01011 | |
| 01001 | |
| 01000 | |
| 11000 | |
| 11001 | |
| 11011 | |
| 11010 | |
| 11110 | |
| 11111 | |
| 11101 | |
| 11100 | |
| 10100 | |
| 10101 | |
| 10111 | |
| 10110 | |
| 10010 | |
| 10011 | |
| 10001 | |
| 10000 |
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