[백준] 4949번: 균형잡힌 세상 (C++)

https://www.acmicpc.net/problem/4949

4949번: 균형잡힌 세상

---

#include<iostream>
#include<string>
#include<stack>
#include<vector>

using namespace std;

int main() {
    char ch;
    int check = 0;
    string str;
    stack<char> s;

    while (true) {
        getline(cin, str);
        if (str[0] == '.') break;

        for (int i = 0; i < str.length(); i++) {
            ch = str[i];
            if (ch == '(') {
                s.push('(');
            }
            else if (ch == '[') {
                s.push('[');
            }
            else if (ch == ')') {
                if (!s.empty() && s.top() == '(') {
                    s.pop();
                }
                else {
                    cout << "no\n";
                    check++;
                    break;
                }
            }
            else if (ch == ']') {
                if (!s.empty() && s.top() == '[') {
                    s.pop();
                }
                else {
                    cout << "no\n";
                    check++;
                    break;
                }
            }
        }
        if (s.empty() && check == 0) {
            cout << "yes\n";
        }
        else if (!s.empty() && check == 0) {
            cout << "no\n";
        }
        while (!s.empty()) {
            s.pop();
        }
        check = 0;
    }
}