1. DFS using depth marker: 每个depth都存一下。然后如果有不符合条件的，存为-1. 一旦有 <0 或者差值大于1， 就全部返回Integer.MIN ...

Java (TM) SE Runtime Environment 18.3 (build 10+46) Java HotSpot (TM) 64-Bit Server VM 18.3 (build 10+46, mixed mode) Wed, 21 Mar 2018 17:30:47 GMT mv binarytrees.java-6.java binarytrees.java 1.02s to ...

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