How is difficulty evaluated and what does acceptance mean?

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    I want to know how the difficulty of a problem is evaluated: it is evaluated by human experts of, or by algorithm-based rules?

    And, what does the acceptance rate mean: it is the ratio of passed submissions to all submissions, or the number of accounts for passed submissions to the number of accounts for all submissions? In short, if I use as a debugging tool, will the failed submissions for debugging affect the final acceptance rate, or not?


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