CodeChef --- Dense Bracket Sequence

Bismillahir Rahmanir Rahim
///Author: Tanvir Ahmmad
///CSE,Islamic University,Bangladesh

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<string>
#include<cstring>
#include<sstream>
#include<cmath>
#include<cstring>
#include<vector>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<vector>
#include<iterator>
#include <functional> ///sort(arr,arr+n,greater<int>()) for decrement of array
/*every external angle sum=360 degree
  angle find using polygon hand(n) ((n-2)*180)/n*/
///Floor[Log(b)  N] + 1 = the number of digits when any number is represented in base b
using namespace std;
typedef long long ll;

ll mod=1000000007;

ll dx[] = { -2, -1, 1, 2, -2, -1, 1, 2 }; ///knight move x-axis
ll dy[] = { -1, -2, -2, -1, 1, 2, 2, 1 }; ///knight move y-axis

int main()
{
    ll tst,n;
    cin>>tst;
    while(tst--)
    {
        string str;
        cin>>n>>str;
        ll i=0,j=n-1,ans=0;
        while(i<=j)
        {
            if(str[i]=='(' && str[j]==')') i++,j--;
            else if(str[i]==')' && str[j]=='(') i++,j--,ans+=2;
            else if(str[i]==')' && str[j]==')') i++,ans++;
            else j--,ans++;
        }
        cout<<ans<<endl;
    }
    return 0;
}
///Alhamdulillah

Problem Link: https://www.codechef.com/START44C/problems/DENSE

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