[프로그래머스] 올바른 괄호 C++

#include<string>
#include <iostream>
#include <stack>
 
using namespace std;
 
bool solution(string s)
{
    stack<char> stack;
 
    for (int i = 0; i < s.length(); i++)
    {
        if (s[i] == '(')
        {
            stack.push(s[i]);
        }
        else
        {
            if (stack.empty() == true)
                return false;
 
            stack.pop();
        }
    }
 
    return stack.empty();
}