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ANARC09A

ANARC09A - Seinfeld


#include <iostream>
#include <stack>

using namespace std;

stack<char> st;


int main()
{
    string s;
    int c, k;

    k = 1;

    while(true)
    {
        cin >> s;

        c = 0;

        if(s[0] == '-')
            break;

        for(int i = 0; i < s.size(); i++)
        {
            st.push(s[i]);

            //stack contains } and { then we can safely remove them from stack
            if(st.top() == '}' && st.size() != 1)
            {
                char a = st.top();
                st.pop();

                char b = st.top(); // if b != { do not remove and push back a also
                if(a != b)
                    st.pop();
                else
                    st.push(a);
            }

        }

        while(!st.empty())
        {
            char a = st.top();
            st.pop();
            char b = st.top();
            st.pop();

            if(a == b)
                c++;
            else // for }{ 2 operations are required
                c += 2;
        }

        cout << k << ". " <<  c << endl;
        k++;

    }
    return 0;
}

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