Did you try my algorithm at Re^2: NP-complete sometimes isn't (A benchmark)? It is guaranteed to always find the best possible answer. It has no bug with repeated numbers. It is not the fastest option, but it may well be fast enough for your purposes.

In reply to Re^5: Divide array of integers into most similar value halves by tilly
in thread Divide array of integers into most similar value halves by Pepe

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