/in/foo.cc: In function 'int main()':
/in/foo.cc:34:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int p = 0;p<v2[i].size();p++){
                       ~^~~~~~~~~~~~~
/in/foo.cc:38:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if(ii>=v.size()||zz>=v2[i].size()) continue;
                ~~^~~~~~~~~~
/in/foo.cc:38:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if(ii>=v.size()||zz>=v2[i].size()) continue;
                              ~~^~~~~~~~~~~~~~
/in/foo.cc:35:17: warning: unused variable 'st' [-Wunused-variable]
             int st = v2[i][p].index;
                 ^~