Binary Tree post order traversal

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One:

　　Using two stacks, stack to traversal the node, stackr to record the parent node when visiting its right-child;

     https://oj.leetcode.com/problems/path-sum/

     https://oj.leetcode.com/problems/binary-tree-postorder-traversal/

Binary Tree post order traversal

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原文地址：http://www.cnblogs.com/majia1949/p/4145274.html