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An algorithm is a sequence of well-defined steps that define an abstract solution to a problem. Use this tag when your issue is related to algorithm design.

3 votes

Caching 1600 integers and searching from treeSet takes a lot of time

You claim the lookup in the TreeSet takes a long time, why don't you use a HashSet which guarantees constant time instead of the log(n) time of TreeSet. Also did you profile your code to verify that …
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