C++ :: Divide Array Into Multiple Arrays

I am trying to do this:

Read a text file which is like:

2
2 10 1 2 7
3 8 3 7 7 10 7

The first line indicates how many paths exist in my design.
The second and third lines are those lines(the first number indicates 2 pairs, so 10,1 and 2,7 are 2 pairs)
The first element in the third line indicates 3 pairs and the pairs are 8,3 and 7,7 and 10,7.

I have been able to read the text file and store these into ONE array. However, I need to divide them up and have each line in a seperate array.

So for example

array alpha to contain 10,1 and 2,7
array beta to contain 8,3 and 7,7, and 10,7

How would you do this?