/in/foo.cc: In function 'void Work1()':
/in/foo.cc:17:6: warning: unused variable 'sup' [-Wunused-variable]
   17 |  int sup, a, b, pos = 0, t = 1;
      |      ^~~
/in/foo.cc: In function 'void Work2()':
/in/foo.cc:50:21: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]
   50 |  GCD = gcd(a, b), a /= GCD, b /= GCD;
      |                   ~~^~~~~~