Leetcode: lowest common ancestor in binary tree

July 30, 2015

problem statement:

lowest common ancestor in binary tree, question No: 236

Try 4 implementations, 2 passes, but 2 failed. 

read blogs: 

http://articles.leetcode.com/2011/07/lowest-common-ancestor-of-a-binary-tree-part-i.html

http://huangyawu.com/leetcode-lowest-common-ancestor-of-a-binary-tree/

http://www.cnblogs.com/chkkch/archive/2012/11/26/2788795.html

write C# code: 

https://github.com/jianminchen/LowestCommonAncestorInBinaryTree/blob/master/LowestCommonAncestorB.cs