BOJ 11899 - 괄호 끼워넣기 [C++]

문제

링크

풀이

#include <iostream>
#include <string>
#include <stack>
using namespace std;
 
void solve(void) {
  string s; cin >> s;
 
  int cnt = 0;
  stack<char> st;
  for (char c : s) {
    if (c == '(') st.push(c);
    else if (st.empty()) cnt++;
    else st.pop();
  }
 
  cout << cnt + st.size();
}
 
int main(void) {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
 
  solve();
  return 0;
}