Sorry, but.. why don't you..

a) compute the height of each subtree. Recusrively, takes O(n).
b) start from the root. if its left subtree is bigger than the right
one, than
solution is on the left, since a symmetric traversal would put the
root after more than half the elements, sorting them.
so, recurse to the left, o.w. adjust k and recurse to the right.

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