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Thus someone know how to solve my problem?
I am going to make a program which is set_difference without using predefined functions???

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Last Post by Narue
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I know how to solve your problem, but the exercise isn't about getting someone else to do your work for you, is it? Were I you, I'd start by studying up on how the predefined functions work to get a better idea of the algorithm at play.

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I don't know what is my first step in solving this problem..,
I only have few knowledge about the program..

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I just told you your first step: do some research on set_difference to learn how it works. If you don't understand the algorithm, implementing it is impossible.

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