foo.cpp: In function 'int main()':
foo.cpp:69:33: error: 'j' was not declared in this scope
  for (k = 1; k <= m; k++) in(i, j), unionSet(i, j);
                                 ^
foo.cpp:41:30: note: in definition of macro 'in'
 #define in(x,y) read(x),read(y)
                              ^
foo.cpp:70:33: error: 'j' was not declared in this scope
  for (k = 1; k <= q; k++) in(i, j), cout << (getFather(i) == getFather(j) ? "Yes\n" : "No\n");
                                 ^
foo.cpp:41:30: note: in definition of macro 'in'
 #define in(x,y) read(x),read(y)
                              ^