문제
링크
풀이
#include <iostream>
#include <string>
#include <stack>
using namespace std;
bool solve(void) {
string s;
getline(cin, s);
if (s == ".") return false;
stack<char> st;
bool ok = true;
for (int i=0; i<s.size(); i++) {
switch (s[i]) {
case '(': case '[': st.push(s[i]);
break;
case ')': if (st.empty() || st.top() != '(') ok = false;
else st.pop();
break;
case ']': if (st.empty() || st.top() != '[') ok = false;
else st.pop();
break;
}
}
if (!st.empty()) ok = false;
cout << (ok ? "yes\n" : "no\n");
return true;
}
int main(void) {
ios::sync_with_stdio(false);
cin.tie(nullptr);
while (solve());
return 0;
}