How to Solve Cousins in Binary Tree I I Problem
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Cousins in Binary Tree II
Given the root of a binary tree, replace the value of each node in the tree with the sum of all its cousins' values. Two nodes of a binary tree are cousins if they have the same depth with different p...
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Understanding the Cousins in Binary Tree I I Problem
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Problem Statement
Given the root of a binary tree, replace the value of each node in the tree with the sum of all its cousins' values. Two nodes of a binary tree are cousins if they have the same depth with different parents. Return the root of the modified tree. Note that the depth of a node is the number of edges in the path from the root node to it.
Cousins in Binary Tree II
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Examples
root = [5,4,9,1,10,null,7][0,0,0,7,7,null,11]The diagram above shows the initial binary tree and the binary tree after changing the value of each node. - Node with value 5 does not have any cousins so its sum is 0. - Node with value 4 does not have any cousins so its sum is 0. - Node with value 9 does not have any cousins so its sum is 0. - Node with value 1 has a cousin with value 7 so its sum is 7. - Node with value 10 has a cousin with value 7 so its sum is 7. - Node with value 7 has cousins with values 1 and 10 so its sum is 11.
root = [3,1,2][0,0,0]The diagram above shows the initial binary tree and the binary tree after changing the value of each node. - Node with value 3 does not have any cousins so its sum is 0. - Node with value 1 does not have any cousins so its sum is 0. - Node with value 2 does not have any cousins so its sum is 0.
Constraints
The number of nodes in the tree is in the range [1, 105].1 <= Node.val <= 104How Interview Coder Helps with Leetcode Problems
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