LeetCode 144. Binary Tree Preorder Traversal

才5%的內存。(⊙﹏⊙),如果不寫free是8.7,寫了free是9.6 代碼 /** * Definition for a binary tree node. * struct TreeNode { * int val; * struct TreeNode *left; * struct TreeNode *right; * }; */ /** * Return an array of size
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