get a range of objects with binary search

Posted by Behrooz on Stack Overflow See other posts from Stack Overflow or by Behrooz
Published on 2010-06-11T07:38:20Z Indexed on 2010/06/11 7:43 UTC
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Filed under:

search

|

binary-search

|

ranges

I have some data like this:

ID  Value  
1   AAA  
1   ABC  
2   dasd  
2   dsfdsf  
2   dsfsd  
3   df  
3   dwqef

they are objects(not plain text).
and i want to get all objects with the ID = 2.
I can do a binary binary search and get the index 3,but how can i get (2 and 4) is there any efficient algorithm?
the real problem has lists with about one Million items.

any language except bf and lisp can help.

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