View Compilation Error

0_0_36651643_24464.cpp: In function 'bool bfs()':
0_0_36651643_24464.cpp:43:32: error: 'flow' was not declared in this scope
         for(int i=h[u]; i!=-1&&flow>res; i=ne[i])
                                ^
0_0_36651643_24464.cpp:43:37: error: 'res' was not declared in this scope
         for(int i=h[u]; i!=-1&&flow>res; i=ne[i])
                                     ^