【leetcode】Symmetric Tree

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【LeetCode】Symmetric Tree 推断一棵树是否是镜像的

题目:Symmetric Tree <span style="font-size:18px;"><span style="font-size:18px;">/**LeetCode Symmetric Tree 对称的树 * 思路:推断一棵树是否对称,1.有左子树就要有右子树 * 2.除根节点外对称节点值要同样 * 注意:对称后就是左子树的左节点和右子树的右节点比較 * Definition for binary tree * public c…

【leetcode】Symmetric Tree

Symmetric Tree Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree is symmetric: 1 / \ 2 2 / \ / \ 3 4 4 3 But the following is not: 1 / \ 2 2 \ \ 3 3 Note:Bonus points if you c…

【LeetCode】Symmetric Tree(对称二叉树)

这道题是LeetCode里的第101道题.是我在学数据结构——二叉树的时候碰见的题. 题目如下: 给定一个二叉树,检查它是否是镜像对称的. 例如,二叉树 [1,2,2,3,4,4,3] 是对称的. 1 / \ 2 2 / \ / \ 3 4 4 3 但是下面这个 [1,2,2,null,3,null,3] 则不是镜像对称的: 1 / \ 2 2 \ \ 3 3 说明: 你可以运用递归和迭代两种方法解决这个问题. 解题思路: 读完题目后我首先想到的是用遍历的方法来解题,树的遍历有三种:前序遍历,中…

【Leetcode】【Easy】Symmetric Tree

Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree is symmetric: 1 / \ 2 2 / \ / \ 3 4 4 3 But the following is not: 1 / \ 2 2 \ \ 3 3 Note:Bonus points if you could solve it b…

【题解】【BT】【Leetcode】Binary Tree Preorder/Inorder/Postorder (Iterative Solution)

[Inorder Traversal] Given a binary tree, return the inorder traversal of its nodes' values. For example:Given binary tree {1,#,2,3}, 1 \ 2 / 3 return [1,3,2]. Note: Recursive solution is trivial, could you do it iteratively? confused what "{1,#,2,3}&…

【LeetCode】Binary Tree Level Order Traversal(二叉树的层次遍历)

这道题是LeetCode里的第102道题. 题目要求: 给定一个二叉树,返回其按层次遍历的节点值. (即逐层地,从左到右访问所有节点). 例如: 给定二叉树: [3,9,20,null,null,15,7], 3 / \ 9 20 / \ 15 7 返回其层次遍历结果: [ [3], [9,20], [15,7] ] 解题代码: /** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *…

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【LeetCode】Symmetric Tree 推断一棵树是否是镜像的

【leetcode】Symmetric Tree

【LeetCode】Symmetric Tree(对称二叉树)

【Leetcode】【Easy】Symmetric Tree

【题解】【BT】【Leetcode】Binary Tree Preorder/Inorder/Postorder (Iterative Solution)

【LeetCode】Binary Tree Level Order Traversal(二叉树的层次遍历)

【LeetCode】Binary Tree Postorder Traversal(二叉树的后序遍历)

【LeetCode】Binary Tree Inorder Traversal(二叉树的中序遍历)

【LeetCode】Binary Tree Preorder Traversal(二叉树的前序遍历)

【LeetCode】Same Tree(相同的树)