/in/foo.cc: In function 'void toposort()':
/in/foo.cc:54:30: error: 'memcpy' was not declared in this scope
  memcpy(now, deg, sizeof(deg));
                              ^
/in/foo.cc: In function 'int toposort1(int)':
/in/foo.cc:71:30: error: 'memcpy' was not declared in this scope
  memcpy(now, deg, sizeof(deg));
                              ^