Leetcode 145. Binary Tree Postorder Traversal
後根遍歷二叉樹
方法1：遞迴
class Solution {
public:
void help(TreeNode* root, vector <int> &re)
{
if (!root) return;
help(root->left, re);
help(root->right, re);
re.push_back(root->val);
}
vector<int> postorderTraversal(TreeNode* root) {
vector<int> re;
help(root, re);
return re;
}
};相關文章
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