[Algo] 66. All Valid Permutations Of Parentheses I
GivenNpairsofparentheses“()”,returnalistwithallthevalidpermutations.AssumptionsN>0ExamplesN=1,allvalidpermutationsare["()"]N=3,allvalidpermutationsare["((()))","(()())","(())()","()(())","()()()"]publ