Codeforces Beta Round #26 (Codeforces format) 26B - Regular Bracket Sequence Solution

 

Problem Link :  https://codeforces.com/problemset/problem/26/B 

Solution in C++:

///La ilaha illellahu muhammadur rasulullah

///******Bismillahir-Rahmanir-Rahim******///

///Abul Hasnat  Tonmoy

///Department of CSE,23rd batch

///Islamic University,Bangladesh

#include <bits/stdc++.h>

using namespace std;

int main()

{

    long long  l,c=0,ans=0,i;

  string s;

  cin>>s;

  l=s.size();

  for(i=0;i<l;i++)

  {

      if(s[i]=='(')

        c++;

      else if(c!=0)

      {

          c--;

          ans++;

      }

  }

  cout<<ans*2<<endl;

}