Top 25 Interview Questions - GeeksforGeeks
1) Lowest common Ancestor (http://www.geeksforgeeks.org/lowest-common-ancestor-binary-tree-set-1/)
2) A unsorted array of integers is given; you need to find the max product formed my multiplying three numbers. (You cannot sort the array, watch out when there are negative numbers)
3) Left View of a tree (http://www.geeksforgeeks.org/print-left-view-binary-tree/
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