[Leetcode] Balanced Binary Tree
問題：給一個二叉樹，寫一個算法判斷這個樹是不是balanced。 Solution #1. 第一次遇到這個問題時我的解法，如下： 寫了一個getDepth()函數，訪問每個節點都要調用一次這個函數。這個Solution也通過了leetcode的驗證程序，但是后來想了想，I ...
原文：leetcode教程系列——Binary Tree
tree是一種常用的數據結構用來模擬真實物理世界里樹的層級結構。每個tree有一個根 root 節點和指向其他節點的葉子 leaf 節點。從graph的角度看，tree也可以看作是有N個節點和N 個邊的有向無環圖。 Binary tree是一個最典型的樹結構。顧名思義，二分數的每個節點最多有兩個children，分別叫左葉子節點與右葉子節點。下面的內容可以讓你學習到： 理解tree的概念以及bi ...
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