How does rclone avoid O(n^2) complexity?

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This is just out of curiosity, but how does rclone avoid an O(n^2) complexity when comparing remotes? Or does it?

When I built my two sync tools (PyFiSync and syncrclone), I developed my own data structure (DictTable) to do this.

I am sure there are better ways (such as comparing two sorted lists or one sorted list and binary search). Just wondering what, if anything, rclone does?

Thanks!

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