/in/foo.cc: In function 'int main()':
/in/foo.cc:34:15: warning: unused variable 'm' [-Wunused-variable]
   34 |     long long m,n;
      |               ^
/in/foo.cc:35:15: warning: 'n' is used uninitialized [-Wuninitialized]
   35 |     long long K=n-1;
      |               ^
/in/foo.cc:34:17: note: 'n' was declared here
   34 |     long long m,n;
      |                 ^