LeetCode 刷题记录 95. Unique Binary Search Trees II

题目： Given an integer n, generate all structurally unique BST’s (binary search trees) that store values 1 … n.java Example:node Input: 3 Output: [ [1,null,3,2], [3,2,null,1], [3,1,null,null,2], [2,1,3]

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