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Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.
Given n = 3, a solution set is:
"((()))", "(()())", "(())()", "()(())", "()()()"
s
[LintCode] Generate Parentheses 生成括号
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原文地址：http://www.cnblogs.com/grandyang/p/5683142.html
