Given a binary tree, find the leftmost value in the last row of the tree. Example 1: Input: 2 / \ 1 3 Output:1 Example 2: Input: 1 / \ 2 3 / / \ 4 5 6 / 7 Output:7 Note: You may assume the tree (i.e., the given root node) is not NULL. 给定一个二叉树,在树的最后…
Given a binary tree, find the leftmost value in the last row of the tree. Example 1: Input: 2 / \ 1 3 Output: 1 Example 2: Input: 1 / \ 2 3 / / \ 4 5 6 / 7 Output: 7 Note: You may assume the tree (i.e., the given root node) is not NULL. -------------…
/** * Definition for a binary tree node. * public class TreeNode { * public int val; * public TreeNode left; * public TreeNode right; * public TreeNode(int x) { val = x; } * } */ public class Solution { Stack<TreeNode> S = new Stack<TreeNode>(…