/in/foo.cc: In function 'int cnt(long long unsigned int, long long unsigned int, int)':
/in/foo.cc:36:20: warning: 'r1' may be used uninitialized [-Wmaybe-uninitialized]
   36 |         int cnt=(r2-r1)/k+1;
      |                 ~~~^~~~
/in/foo.cc:16:28: note: 'r1' was declared here
   16 |         unsigned long long r1,r2;
      |                            ^~
/in/foo.cc:36:20: warning: 'r2' may be used uninitialized [-Wmaybe-uninitialized]
   36 |         int cnt=(r2-r1)/k+1;
      |                 ~~~^~~~
/in/foo.cc:16:31: note: 'r2' was declared here
   16 |         unsigned long long r1,r2;
      |                               ^~