LeetCode – Binary Tree Level Order Traversal (Java)

Given a binary tree, return the level order traversal of its nodes’ values. (ie, from left to right, level by level). For example: Given binary tree {3,9,20,#,#,15,7}, 3 / \ 9 20 / \ 15 7 return its level order traversal as [[3], [9,20], [15,7]] Java Solution 1 It is obvious that this problem can … Read more