I need to read some lines from an input file into vector (of integers) and c++ is new to me so I'm having trouble understanding huge codes with lots of functions.
Can you tell me how to do this the most basic way?

In my file I have something like this:

```
5 6 11 3 4
2 3 1
1 
9

```

I wrote the input file with another program so I can present in it the number of vectors (4 in this case) and their size (5, 3, 1, 1) if I makes the reading easier.

I means I can present the information in any form... just need to know which one is better and how to use it.