I have a set of numbers:
1,22
1,46
32,1
1,9
32,22
1,14
1,45
1,33
33,22
45,22
32,46
32,9
3,1
3,9
3,22
3,32
3,46
9,22
46,22
46,45
46,33
15,1
15,46
15,6
15,22
15,3
15,9
15,45
15,33
15,32
15,14
I need to get combinations from them with a rule that each new pair can only be appended if the latter number is the same as the first in the pair.
For example if I have a pair {15,1}, the next on can be only {1,46} and the next {46,45}, and the final pair must end with the first number of the whole set. In this case it could be for example {45,1}.
So the end result of sets with 4 set limit would be
{15,1,1,46,46,45,45,1}
I can do basic power sets and generate all possible combinations from set of numbers but this seems to be too advanced for me.
I can do C, Javascript or PHP so all the help or solutions to this are highly appreciated. And for clarification, this is not a homework, this is just something I would like to learn and understand.