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Find the first unique number in a given sequence.
Find a symmetry point of a string, if any.
Compute the height of a binary tree.
Compute number of inversion in an array.
Reduce a string containing instances of the letters "A", "B" and "C" via the following rule: remove one occurrence of "AA", "BB" or "CC".
Check whether a given polygon in a 2D plane is convex; if not, return the index of a vertex that doesn't belong to the convex hull.