655. Print Binary Tree 解题报告(树)

第一部分:搜索、遍历  【例子1】655. Print Binary Tree Example 1: Input: 1 / 2 Output: [["", "1", ""], ["2", "", ""]]   Example 2: Input: 1 / \ 2 3 \ 4 Output: [["", "", "", "1",
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