https://leetcode.com/problems/generate-parentheses/
Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.
使用动态规划，分析子问题：每次加括号要么加在外面，要么加在旁边。
![LeetCode 刷题记录: 101. Symmetric Tree [Python]](/images/thumbnail.svg)
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