/in/foo.cc: In function 'int main()':
/in/foo.cc:20:47: warning: unused variable 'b' [-Wunused-variable]
   20 |         int i, j, k, n, sum, a[9][9] = { 0 }, b[9] = { 0 },bz[100] = { 0 };
      |                                               ^