摘要：
Given an integer n, return all the structurally unique BST's (binary search trees), which has exactly n nodes of unique values from 1 to n. Return the 阅读全文
posted @ 2020-06-23 09:32
CNoodle
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摘要：
Given the root of a binary tree, return the average value of the nodes on each level in the form of an array. Answers within 10-5 of the actual answer 阅读全文
posted @ 2020-06-23 05:57
CNoodle
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