foo.cc: In function ‘int FindMax(int*, int)’:
foo.cc:11:17: warning: unused variable ‘kk’ [-Wunused-variable]
   11 |         int k=0,kk=0;
      |                 ^~
foo.cc: In function ‘int main()’:
foo.cc:30:13: warning: unused variable ‘aa’ [-Wunused-variable]
   30 |         int aa = 0;
      |             ^~