@all
i m thinking of BST whose node structure is (year,month,date)
a node n1< node n2 if (year1 < year2)
or (if year1==year2  && month1 <month2)
or (if year1==year2  && month1 =month2 && date 1 < date2)
like partial order set ...


we can have AVL tree / threaded binary three (to get successor / predessor )
at constant tym..


comment plz..

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