/in/foo.cc: In function 'void sc(int, int)':
/in/foo.cc:55:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j;
        ^
/in/foo.cc: In function 'void sb(int, int)':
/in/foo.cc:82:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,x;
        ^
/in/foo.cc:82:10: warning: unused variable 'x' [-Wunused-variable]
  int i,j,x;
          ^
/in/foo.cc: In function 'void sa(int, int)':
/in/foo.cc:104:6: warning: unused variable 'i' [-Wunused-variable]
  int i,j,x;
      ^
/in/foo.cc:104:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,x;
        ^