Clues binary tree is changed, the main function in a global variable pre assignment is empty, then the binary tree and p per incoming order cues in recursive functions, clues to the first node, the pre how to p precursors, not in front of the statement said the p precursor assigned to the pre ah, don't understand is why, just in front of the inside the main function has a pre assignment is empty,

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I hope it can help you: https://blog.csdn.net/it_xiangqiang/category_10581430.html
I hope it can help you: https://blog.csdn.net/it_xiangqiang/category_10768339.html