二叉树（binary tree）
在写这篇文章之前说一下数据结构和算法这个系列，这个系列包含了很多东西，比如啥子排序，线性表，广义表，树，图这些大家都是知道的，但是这些东西我们学了之后工作中能用到的又有多少呢，据我所知绝大部分公司，一 ...
原文：[LeetCode] 968. Binary Tree Cameras 二叉树相机
Given a binary tree, we install cameras on the nodes of the tree. Each camera ata node can monitorits parent, itself, and its immediate children. Calculate the minimum number of cameras needed to mon ...
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