Find all combinations of a given set of numbers

Question

say I have a set of numbers \'0\', \'1\', \'2\', ..., \'9\'. I want to find all numbers that contain exactly one of each of the numbers in my set.

The problem is: Be

Answer 1

So, let's say you have the numbers 1, 2 and 3.

If you are expecting the six numbers 123, 132, 213, 231, 312 and 321 to be the correct answer, what you're looking for is some code to generate all permutations of a set, that'll be faster than almost anything else for problems of an interesting size. You're looking at O(n!) as a best case, though.