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Mar 8, 2022 at 8:57 history edited att CC BY-SA 4.0
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Mar 8, 2022 at 8:28 comment added att @theorist I agree on (1), but I felt it was interesting enough to leave be. As for (2), I'm fairly liberal with list output formats, since pretty much any expression with arguments can be interpreted as one; StringJoin is nice to use since it's Flat and <> is short. I do consider List and Sequence to be more "pure" though; we can convert it into Sequence output for 41 bytes.
Mar 8, 2022 at 6:53 comment added theorist (1) Since the OP asks for a "strictly decreasing array", I think your output for Last@Pick[s=Subsets@Range@#,Tr/@s,#]& needs to be reversed. (2) I didn't know it was permitted to provide an answer in the functional form you gave with f@n_:=#<>f[n-#]&@Round@√(2n) f@0="", so that's good to know. But I don't know whether a StringJoin of integers qualifies as an array.
Mar 8, 2022 at 3:20 history edited att CC BY-SA 4.0
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Mar 7, 2022 at 17:42 history answered att CC BY-SA 4.0