[백준]9012-괄호(설명X)

#include <iostream>
#include <stack>
using namespace std;
 
int main()
{
    int argc;
    cin >> argc;
    for (size_t i = 0; i < argc; i++)
    {
        string str;
        cin >> str;
        stack<char> vps;
        for (size_t j = 0; j < str.size(); j++)
        {
            if (str[j] == '(')
                vps.push('(');
            else if (vps.size() == 0) {
                vps.push('(');
                break;
            }
            else
                vps.pop();
        }
        if (vps.size() > 0)
            cout << "NO" << endl;
        else
            cout << "YES" << endl;
    }
    return 0;
}