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2
votes
4answers
187 views

Algorithm for permutations of a string of characters, with no duplicate orders

I've seen a lot of good questions about similar problems but not exactly what I'm looking for. Given: a non-unique set of symbols (or characters) (1, 1, 2, 3) Expected: an output similar to this (...
-1
votes
1answer
109 views

How to maintain unique, customer facing Booking or Reservation Ids

I am facing trouble in creating a unique, customer facing Booking Id. It's a simple thing to do at backend where we can create a UUID and maintain uniqueness. But the UUID looks ugly from a Frontend ...
-1
votes
2answers
103 views

Identifying similar customer data [duplicate]

I have a large database of customers. There's a need to identify customers who have two or more customer IDs. This comes mostly from people at the front-desk creating new customers instead of ...
1411
votes
11answers
647k views

Which hashing algorithm is best for uniqueness and speed?

Which hashing algorithm is best for uniqueness and speed? Example (good) uses include hash dictionaries. I know there are things like SHA-256 and such, but these algorithms are designed to be secure,...