[Tutor] suggestions for read unread items datastructure

[anil maran]

suggestions for read unread items datastructure     [input]   [input]   [input]   [input]              

keep a list of read and unread items

hi guys
i m building an rss reader and i want you suggestions for datastructure
for keeping read and unread list for each use
i m assuming it will be very sparse
thanks

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