/in/foo.cc: In function 'int main()':
/in/foo.cc:19:12: warning: unused variable 'a' [-Wunused-variable]
  long long a=ksm(m,n),b=ksm(m-1,n-1);
            ^
/in/foo.cc:19:23: warning: unused variable 'b' [-Wunused-variable]
  long long a=ksm(m,n),b=ksm(m-1,n-1);
                       ^