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/* // Definition for a Node. class Node { public: int val; vector children; Node() {} Node(int _val, vector _children) { val = _val; children = _children; } }; *... 阅读全文
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Recurisve: Iteratve: 阅读全文
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题目： Given an n-ary tree, return the preorder traversal of its nodes' values. For example, given a 3-ary tree: Return its preorder traversal as: [1,3,5 阅读全文