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+%22%22%22Leetcode 22. Generate Parentheses%0AMedium%0A%0AURL: https://leetcode.com/problems/generate-parentheses/%0A%0AGiven n pairs of parentheses, write a function to generate %0Aall combinations of well-formed parentheses.%0A%0AFor example, given n = 3, a solution set is:%0A%5B%0A  %22((()))%22,%0A  %22(()())%22,%0A  %22(())()%22,%0A  %22()(())%22,%0A  %22()()()%22%0A%5D%0A%22%22%22%0A%0Aclass Solution(object):%0A    def generateParenthesis(self, n):%0A        %22%22%22%0A        :type n: int%0A        :rtype: List%5Bstr%5D%0A        %22%22%22%0A        pass%0A%0A%0Adef main():%0A    pass%0A%0A%0Aif __name__ == '__main__':%0A    main()%0A

Add lc022_generate_parentheses.py