dDdble - Online IDE & Debugging Tool

#include <iostream>
using namespace std;

int main() {
	string s;
	cin>>s;
	int countL=0;
	int countR=0;
	int n=0;
	for (int i=0;i<s.size();i++){
		//cout<<s[i];
		if (s[i]=='('){
			countL++;
		}
		if (s[i]==')'){
			countR++;
			if (countL==0){
				n++;
			}
			else {
				countL--;
			}
		}
	}
	cout<<n+countL;
	return 0;
}