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Thank you!!!

ok, but do you have an idea how can i link between the trees?

but if i have 3 persons for example:
id = 1, addr = z st
id = 2, addr = h st
id = 3, addr = a st

the id's tree will be like: (if i sort it by the id...)
2
1 3
...

my PERSON type have ID, fname, lname, address
and I built one tree that have that type.
you mean I should build 4 trees (1- ID, 2 - fname, 3 - lname, 4 - address) instead?
how will i do the link...

how to do it?

yes, the "DATA" of the tree is PERSON type (that i create) that have the following information about each person: ID, fname, lname, address.
the tree sorted by the ID
but also i want to search by...

The structure should support small and very large number of records.
The Tree already supports the search (quick and eddicient) records by key field, the ID Number of structure person).

What I'm...

Hello,

I am writing a program that maintains basic information about people (each person have id num, first name, last name).
I keep all the data using a binary tree, which DATA is PERSON type...