You are given the root of a binary tree with n nodes where each node in the tree has node.val coins. There are n coins in total throughout the whole tree.
In one move, we may choose two adjacent nodes and move one coin from one node to another. A move may be from parent to child, or from child to parent.
\n\nReturn the minimum number of moves required to make every node have exactly one coin.
\n\n\n
Example 1:
\n![\"\"](\"https://assets.leetcode.com/uploads/2019/01/18/tree1.png\")
\n\nInput: root = [3,0,0]\nOutput: 2\nExplanation: From the root of the tree, we move one coin to its left child, and one coin to its right child.\n\n\n
Example 2:
\n![\"\"](\"https://assets.leetcode.com/uploads/2019/01/18/tree2.png\")
\n\nInput: root = [0,3,0]\nOutput: 3\nExplanation: From the left child of the root, we move two coins to the root [taking two moves]. Then, we move one coin from the root of the tree to the right child.\n\n\n
\n
Constraints:
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