[LeetCode] Sum of Left Leaves 左子葉之和
Find the sum of all left leaves in a given binary tree. Example: 這道題讓我們求一棵二叉樹的所有左子葉的和，那么看到這道題我們知道這肯定是考二叉樹的遍歷問題，那么最簡潔的寫法肯定是用遞歸，由於我們只需要累加左子葉 ...
原文：[LeetCode] Map Sum Pairs 映射配對之和
Implement a MapSum class withinsert, andsummethods. For the methodinsert, you ll be given a pair of string, integer . The string represents the key and the integer represents the value. If the key al ...
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