872. Leaf-Similar Trees

1，題目要求 Consider all the leaves of a binary tree. From left to right order, the values of those leaves form a leaf value sequence. 判斷兩棵樹的葉子節點序列是否相同。node 2，題目思路 並非很難，只不過利用dfs的方法對樹進行遍歷，並利用vector對葉子節點進行記錄

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