Definition树的结构如下： /** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode() : val(0), left(nullptr), right(nullptr) {} * TreeNode(int x) : val(x), left(nullptr), right(nullptr) {} * TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {} * }; */前序遍历 preordervoid printTree(TreeNode* root) { if(root == nullptr) return; ans.push_back(root->val); printTree(
Genghong Hu
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