View Compilation Error

0_0_33632738_17350.cpp: In function 'bool dinic_bfs()':
0_0_33632738_17350.cpp:69:22: error: 'i' does not name a type
         for(register i = head[u]; i != -1; i = edge[i].next)
                      ^
0_0_33632738_17350.cpp:69:35: error: expected ';' before 'i'
         for(register i = head[u]; i != -1; i = edge[i].next)
                                   ^
0_0_33632738_17350.cpp:69:35: error: 'i' was not declared in this scope