今�Hの国の呵呵君: [Algorithm]Get Distance Between Two Nodes in Binary Tree



今�Hの国の呵呵君: [Algorithm]Get Distance Between Two Nodes in Binary Tree

两个Node的距离取决于从node1到node2经过的edge数,如果考虑用类似LCA的解法的话,如果两个node的LCA是其中一个node,因为我们的算法不会再往下递归了,所以没法得到两者的距离。所以这里我们先计算LCA,之后算出node1和node2和LCA的depth,depth1 + depth2 - 2 * depthLCA就是最终的结果。找LCA的时间复杂度是O(n),因为是binary tree,找depth的时间复杂度也是O(n),所以总的时间复杂度是O(n),代码如下:

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