修复226题单元测试的问题 #109
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修复226题单元测试的问题 #109
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将TreeNode转换成slice的时候，应该使用
structures.Tree2ints按行还原，而不应该使用structures.Tree2Preorder，否则问题中的例子会输出[4 7 9 6 2 3 1]，而不是[4 7 2 9 6 3 1]。