Summing a 2D list

[Diez B. Roggisch]

Mark wrote:

> Hi all,
> 
> I have a scenario where I have a list like this:
> 
> User            Score
> 1                 0
> 1                 1
> 1                 5
> 2                 3
> 2                 1
> 3                 2
> 4                 3
> 4                 3
> 4                 2
> 
> And I need to add up the score for each user to get something like
> this:
> 
> User            Score
> 1                 6
> 2                 4
> 3                 2
> 4                 8
> 
> Is this possible? If so, how can I do it? I've tried looping through
> the arrays and not had much luck so far.
> 
> Any help much appreciated,

Show us your efforts in code so far. Especially what the actual data looks
like. Then we can suggest a solution.

Diez