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Not sure it's the best solution for storage, but what you could do is have a table of the form EmailID, From, To <-- this is only one person.
- Some Guy December 04, 2014So say A sends first email to P1, P2 and P3,
then you store three records:
1, A, P1
1, A, P2
1, A, P3
as A sends more emails:
1, A, P1
1, A, P2
1, A, P3
2,A,P1
2,A,P3
3,A,P2
3,A,P4
3,A,P3
4,A,P2
4,A,P3
It would then be easy to get all the weights for each edge.
As for the Data Structure, I'd probably use an Adjacency List, since using a Matrix could be a lot more expensive memory-wise (suppose a 1000 contact list, you'd have 1M fields).