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Java users note that if you're using HashMap to represent number frequencies, make sure you use the .equals() method to compare them and not == because Integer is an object while int is a primitive, that was causing me WA
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Missing Numbers
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Java users note that if you're using HashMap to represent number frequencies, make sure you use the .equals() method to compare them and not == because Integer is an object while int is a primitive, that was causing me WA