Description
A full binary tree is defined as a binary tree in which all nodes have either zero or two child nodes. Conversely, there is no node in a full binary tree, which has one child node. More information about full binary trees can be found here.
Full Binary Tree
1 / 2 3 / 4 5
Not a Full Binary Tree
1 / 2 3 / 4
Have you met this question in a real interview?
ExampleGiven tree {1,2,3}, return true
Given tree {1,2,3,4}, return false
Given tree {1,2,3,4,5} return true
public class Solution { /** * @param root: the given tree * @return: Whether it is a full tree */ public boolean isFullTree(TreeNode root) { // write your code here if (root == null) return true; if (root.left == null && root.right == null) return true; if (root.left == null && root.right != null) return false; if (root.left != null && root.right == null) return false; return isFullTree(root.left) && isFullTree(root.right); } }
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