leetcode-js/leetcode/outline/solution_list #2
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leetcode-js/leetcode/outline/solution_list
2.6 树 树的定义 定义 树（Tree） 是由 n ≥ 0 个节点与节点之间的关系组成的有限集合。当 n = 0 时称为空树，当 n > 0 时称为非空树。。
https://2xiao.github.io/leetcode-js/leetcode/outline/solution_list.html
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