示例 ：

输入：s = "(abcd)"

输出："dcba"

示例 ：

输入：s = "(u(love)i)"

输出："iloveu"

示例 ：

输入：s = "(ed(et(oc))el)"

输出："leetcode"

示例 ：

输入：s = "a(bcdefghijkl(mno)p)q"

输出："apmnolkjihgfedcbq"

class Solution {

public:

    string reverseParentheses(string s) {

        int len = s.length();

        stack<int> sk;

        for(int i=;i<len;++i){

            char c = s[i];

            if(c == '(') sk.push(i);

            else if(c == ')'){

                auto it = sk.top();

                sk.pop();

                reverse(s.begin()+it+,s.begin()+i);

            }

        }

        auto it = s.begin(),e = s.end();

        while(it!=e){

            if(*it=='(' || *it==')') it = s.erase(it);

            else ++it;

        }

        return s;

    }

};