求PReorder，没啥好说的
/** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */class Solution {public: vector<int>ve; void preo(TreeNode* root){ if(root == NULL) return ; ve.push_back(root -> val); preo(root -> left); preo(root -> right); } vector<int> preorderTraversal(TreeNode* root) { preo(root); return ve; }};新闻热点
疑难解答
