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  1. Prepare
  2. Data Structures
  3. Stacks
  4. Balanced Brackets
  5. Discussions

Balanced Brackets

  • benedict_
     + 26 comments
    string isBalanced(string s) {
    // Complete this function
    std::stack<char> st;
    st.push('@');
    
    for(int i=0;i<s.length();i++)
    {
        if(s[i]=='('||s[i]=='['||s[i]=='{')
            st.push(s[i]);
        else
        {
            while(!st.empty()&&((s[i]==')'&&st.top()=='(')||(s[i]==']'&&st.top()=='[')||(s[i]=='}'&&st.top()=='{')))
                  {
                      st.pop();
                  }
        }
    }
                  if(st.top()=='@')
                  return "YES";
                  else
                  return "NO";
}

    why this code fail for two of the testcases.