What are some algorithms and utils good to know?

I am trying to improve my overall programmingskills
by creating an API of various helper methods thatcan
be used in day to day programming. So far, I have
written my own implementation of the JavaCollection
Framework.
What are some other useful utils to write? Likehow
to find a string (forward and/or reversed) withina
body of text.
I am open to suggestions. Thanks.If you have indeed done this, I would say your
overall programming skill is pretty alright. Why not
move into implementing a faster BigDecimal. Why did
you chose to rewrite the JFC into your own code?he hasn't re-written the JFC. he's "implemented" the Collections API

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What are some algorithms and utils good to know?

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