View Compilation Error

0_0_25998385_3080.cpp: In function 'pii add(pii, pii)':
0_0_25998385_3080.cpp:12:35: error: could not convert 'std::make_pair<int, std::pair<long long int, long long int>&>((* &0), (* & y))' from 'std::pair<int, std::pair<long long int, long long int> >' to 'pii {aka std::pair<long long int, long long int>}'
     if(up==0) return make_pair(0,y);
                                   ^