Parentheses Balance

#include <bits/stdc++.h>
using namespace std;
int main(){
    int t , n;
    string s;
    cin >> t;
    getline(cin , s);
    while(t--){
        getline(cin , s);
        if(s.empty()){
            cout << "Yes" << endl;
            continue;
        }
        int n = s.size();
        stack<char> my;
        bool f = true;
        for(int i = 0; i < n; i++){
           if((s[i] == '(') || (s[i] == '[')){
               my.push(s[i]);
               continue;
            }
            if(my.empty()){
                f = false;
                break;
            }
            if((my.top() == '[') && (s[i] == ')')){
                f = false;
                break;
            }
            if((my.top() == '(') && (s[i] == ']')){
                f = false;
                break;
            }
            my.pop();
       }
       if(!my.empty()){
           f = false;
       }
       if(f){
            cout << "Yes" << endl;
       }else{
            cout << "No" << endl;
       }
    }
}