What makes a tree 'balanced'?
In this chapter, we are going to study what makes a tree balanced. We are also going to look at a high-level description of the algorithm used to determine if a given tree is balanced.
Introduction
A binary tree is height-balanced if, for each node in the tree, the difference between the height of the right subtree and the left subtree is at most one.
Look at the illustration below of a height-balanced tree. Notice how the left and right sub-trees all appear at the same height.
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