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Which decreases the space complexity but increases the time complexity.


No, the time complexity is the same: O(n log n). The author of the top answer links to his book, where you can find a proof of time complexity:

https://sites.google.com/site/algoxy/home/elementary-algorit...


...but it increases run time. It's fine not to care on hidden constants while analyzing algorithms, but not while using them in real life




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