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I believe it has something to do with declaring paramter in functions as vector as '&vec' rather than just 'vec'. Can't remember for certain. Also, you might wanna declare the count variable as long long for larger data sets.
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Merge Sort: Counting Inversions
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I believe it has something to do with declaring paramter in functions as vector as '&vec' rather than just 'vec'. Can't remember for certain. Also, you might wanna declare the count variable as long long for larger data sets.