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  1. #include <iostream>
  2. #include <stack>
  3. using namespace std;
  4.  
  5. int main() {
  6.     string s;
  7.     cin >> s;
  8.     stack<char> st;
  9.     for (char c : s) {
  10.         if (c == '(' || c == '{' || c == '[') {
  11.             st.push(c);
  12.         } else {
  13.             if (st.empty() || (c == ')' && st.top() != '(') || (c == '}' && st.top() != '{') || (c == ']' && st.top() != '[')) {
  14.                 cout << "no";
  15.                 return 0;
  16.             }
  17.             st.pop();
  18.         }
  19.     }
  20.     if (st.empty()) {
  21.         cout << "yes";
  22.     } else {
  23.         cout << "no";
  24.     }
  25.     return 0;
  26. }
Success #stdin #stdout 0s 5304KB
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https://ideone.com/ftCko4
language:
C++ (gcc 8.3)
created:
13 days ago
visibility:
public

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