56求条

#include<bits/stdc++.h>
using namespace std;
string s;
int main(){
    cin >> s;
    for(int i = 0;i < s.size();i++){
        if(s[i] == '(' or s[i] == ')'){
            if(s[i] == '(' and s[i+1] == ')'){
                cout << '(' << ')';
                i++;
                continue;
            }
            else cout << '(' << ')' ;
        } else if(s[i] == '[' or s[i] == ']'){
            cout << '[' << ']' ;
        }
    }
    return 0;
}

帮帮孩子吧