Check whether a given binary tree is perfect or not
In computer science and binary tree data structures, a perfect binary tree is a binary tree where all of the nonleaf nodes have exactly two children and all the leaves are at the same level. In other words, a perfect binary tree is a binary tree in which every level, except possibly the last, is completely filled, and all nodes are as far left as possible.
Therefore, to check whether a given binary tree is perfect or not, you need to verify if the tree satisfies the following conditions:
 All nonleaf nodes have exactly two children.
 All the leaves are at the same level, i.e., they have the same depth.
 Every level, except possibly the last, is completely filled, i.e., there are no missing nodes.
If all these conditions are true, the binary tree is perfect, otherwise, it is not perfect.
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