How do you navigate the tree to properly evaluate the expression represented by that tree? You do that by using apostorder traversal- a special case ofdepth-first traversal- which starts at the root node and recursively visits the children of each node from left to right. The postorder traver...
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and requires space proportional to the tree’s height for the call stack. We can reduce the time complexity toO(n)by following a different approach that doesn’t involve searching for an index that separates the left and right subtree keys in a postorder sequence. ...