Generate parentheses

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Given an integer n, generate all combinations of well-formed n-pair parentheses strings. - For example, if n=2, "()()" "(())" are the possible valid solutions. Well-formed parentheses strings are balanced. - For example, "((()))" is balanced, while "((()" is not. For example, given n = 3, a solution set is: [ "((()))", "(()())", "(())()", "()(())", "()()()" ] The output must be so

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solution.cppC++17

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