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Re:Google: 90% of our engineers use the software you wrote (... by blahblah3 on Thursday June 11, 2015 @04:16PM (#9702090)
i'm not exactly sure either, too bad he didnt define "invert".

i based my comment on the only thing I could find: https://wwwx.cs.unc.edu/~duozhao/entry/2014/12/binary-tree-u...

this is only slightly harder than the trivial (if u know recursion) "mirroring" a tree problem

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