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Construct a binary tree from its in-order and pre-order traversals
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The Fibonacci secret hidden in coding problems
Many problems are disguised as combinatorics and can be easily solved using Fibonacci numbers.
Finding the frequency of an element in O( log n ) time.
If the array is sorted, then the frequency of any element can be found easily by using binary search.
Construct a binary tree from its in-order and pre-order traversals
A simple recursive approach to construct a binary tree from its traversals
