View Compilation Error

0_0_30092084_22990.cpp: In member function 'int Dinic::dfs(int, int)':
0_0_30092084_22990.cpp:89:27: error: invalid initialization of reference of type 'int&' from expression of type 'll {aka long long int}'
         for(int &i = cur[x]; i < G[x].size(); i++)
                           ^