LeetCode 94. 二叉树的中序遍历
题目链接:https://leetcode-cn.com/problems/binary-tree-inorder-traversal/
给定一个二叉树,返回它的中序 遍历。
1 /** 2 * Definition for a binary tree node. 3 * struct TreeNode { 4 * int val; 5 * TreeNode *left; 6 * TreeNode *right; 7 * TreeNode(int x) : val(x), left(NULL), right(NULL) {} 8 * }; 9 */ 10 class Solution { 11 public: 12 vector<int> inorderTraversal(TreeNode* root) { 13 vector<int> result; 14 const TreeNode *p=root; 15 stack<const TreeNode *> s; 16 while(!s.empty()||p!=nullptr){ 17 if(p!=nullptr){ 18 s.push(p); 19 p=p->left; 20 }else{ 21 p=s.top(); 22 s.pop(); 23 result.push_back(p->val); 24 p=p->right; 25 } 26 } 27 return result; 28 } 29 };