226. Invert Binary Tree(翻轉樹)
Invert a binary tree.
Example:
Input:
4 / 2 7 / \ / 1 3 6 9
Output:
4 / 7 2 / \ / 9 6 3 1
Trivia:
This problem was inspired by this original tweet by Max Howell:
Google: 90% of our engineers use the software you wrote (Homebrew), but you can’t invert a binary tree on a whiteboard so f*** off.
方法一:遞歸
時間復雜度:o(n) 空間復雜度:o(1)
226. Invert Binary Tree(翻轉樹)
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