adding to multidim vector

I have a multidimensional vector, with the first index being numbers 1-9 for amount of rows and the second being the values in that specific row...Whats the best way to add a int to a specific row...

Just doing a VECNAME[indexone].push_back() does not seem to add the int into indexone's row...Any help? Thanks

Could you provide more code? That looks fine as is, but there are a bunch of different places where something might be wrong.