The width of one level is defined as the length between the end-nodes (the leftmost and rightmost non-null nodes), where the null nodes between the end-nodes that would be present in a complete binary tree extending down to that level are also counted into the length calculation.
The maximum width of a tree is the maximum width among all levels.
Given the root of a binary tree, return the maximum width of the given tree.
Example 1
Input: root = [10, 20, 30, 40, 60]
Output: 2
Explanation: There is one node on level 1(10) There is two node on level 2(20, 30) There is two node on level 3(40, 60) Hence the answer is 2
Example 2
Input: root = [1, 2, 3]
Output: 2
Explanation: On the first level there is only one node 1. On the second level there are two nodes 2, 3 clearly it is the maximum number of nodes at any level
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