View Compilation Error

0_0_14712640_19779.cpp: In function 'int bfs1(int, int)':
0_0_14712640_19779.cpp:15:40: error: expression list treated as compound expression in initializer [-fpermissive]
 #define mem(v,n) memset(v,(n),sizeof(v))
                                        ^
0_0_14712640_19779.cpp:95:29: note: in expansion of macro 'mem'
     int head = 0, tail = 1, mem(vis, false);
                             ^
0_0_14712640_19779.cpp: In function 'int bfs2(int, int)':
0_0_14712640_19779.cpp:15:40: error: expression list treated as compound expression in initializer [-fpermissive]
 #define mem(v,n) memset(v,(n),sizeof(v))
                                        ^
0_0_14712640_19779.cpp:112:29: note: in expansion of macro 'mem'
     int head = 0, tail = 1, mem(vis, false);
                             ^