View Compilation Error

0_0_17543447_14656.c:10:26: error: expected ';', ',' or ')' before '&' token
 void bfs(int x,int y,int &o,int &v,int &flag)
                          ^
0_0_17543447_14656.c: In function 'main':
0_0_17543447_14656.c:43:2: error: expected expression before '/' token
  //freopen("input.txt","r",stdin);
  ^