Given the root of a binary tree, return the maximum width of the given tree.
The maximum width of a tree is the maximum width among all levels.
\n\nThe 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.
\n\nIt is guaranteed that the answer will in the range of a 32-bit signed integer.
\n\n\n
Example 1:
\n![\"\"](\"https://assets.leetcode.com/uploads/2021/05/03/width1-tree.jpg\")
\n\nInput: root = [1,3,2,5,3,null,9]\nOutput: 4\nExplanation: The maximum width exists in the third level with length 4 (5,3,null,9).\n\n\n
Example 2:
\n![\"\"](\"https://assets.leetcode.com/uploads/2022/03/14/maximum-width-of-binary-tree-v3.jpg\")
\n\nInput: root = [1,3,2,5,null,null,9,6,null,7]\nOutput: 7\nExplanation: The maximum width exists in the fourth level with length 7 (6,null,null,null,null,null,7).\n\n\n
Example 3:
\n![\"\"](\"https://assets.leetcode.com/uploads/2021/05/03/width3-tree.jpg\")
\n\nInput: root = [1,3,2,5]\nOutput: 2\nExplanation: The maximum width exists in the second level with length 2 (3,2).\n\n\n
\n
Constraints:
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