static int wing=[]()

 {

     std::ios::sync_with_stdio(false);

     cin.tie(NULL);

     return ;

 }();

 class Solution

 {

 public:

     int calPoints(vector<string>& ops)

     {

         int lastvalid=;

         int sz=ops.size();

         vector<int> sore(sz+,INT_MIN);

         for(string &s:ops)

         {

             if(s[]=='+')

             {

                 sore[lastvalid]=sore[lastvalid-]+sore[lastvalid-];

                 lastvalid++;

             }

             else if(s[]=='D')

             {

                 sore[lastvalid]=sore[lastvalid-]*;

                 lastvalid++;

             }

             else if(s[]=='C')

                 lastvalid--;

             else

                 sore[lastvalid++]=stoi(s);

         }

         return accumulate(sore.begin(),sore.begin()+lastvalid,);

     }

 };