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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     ios::sync_with_stdio(false);
  6.     cin.tie(nullptr);
  7.  
  8.     string S;
  9.     cin >> S;
  10.     long long open = 0, ans = 0;
  11.     for (char c : S) {
  12.         if (c == '(') {
  13.             open++;
  14.         } else if (c == ')') {
  15.             if (open > 0) {
  16.                 open--;
  17.                 ans += 2;
  18.             }
  19.         }
  20.     }
  21.     cout << ans << "\n";
  22.     return 0;
  23. }
  24.  
Success #stdin #stdout 0s 5312KB
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https://ideone.com/plrTZo
language:
C++14 (gcc 8.3)
created:
109 days ago
visibility:
secret

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