> Whaaaaa? I can't find this, but it seems like such a weird operation. Got a link? https://wwwx.cs.unc.edu/~duozhao/entry/2014/12/binary-tree-upside-down/ htt

> Whaaaaa? I can't find this, but it seems like such a weird operation. Got a link? https://wwwx.cs.unc.edu/~duozhao/entry/2014/12/binary-tree-upside-down/ https://wwwx.cs.unc.edu/~duozhao/entry/2014/12/binary-tree-u...