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Subject: hash tables question

Author: blass uri

Date: 00:27:07 06/25/00


Can somebody post a C program that translates arrays to 32 bits integers when
usually different arrays get different numbers and also translates it in a way
that it is easy to find if the 32 bits integer is new?

I think that this is the idea behind hash tables

I need it for my program that I use to solve equations and inequalities.

I have an array possolution[256][100000] and
I need to check if the possolution[256][i] is not identical to
possolution[256][j]
for all j<i(I do i++ only if it is not identical).

If I can calculate the hash entry of possolution[256][i] and discover in a short
time that the hash entry of possolution[256][i] is different than the hash entry
of possolution[256][j] for j<i it will save my program a lot of time

I need to know also how to do it in C with O(log[i]) steps and not in O(i) steps
and I know only how to do it theoretically in O(log[i]) steps but I do not know
how to do it in C because I do not know how to push an array forward(if I have
an array hash[100000] I do not know how to do for (i=35000;i<90000;i++)
hash[i]=hash[i+1] in a short time)

Uri



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