/in/foo.cc: In function 'int main()':
/in/foo.cc:19:23: warning: variable 'indexmax' set but not used [-Wunused-but-set-variable]
   19 |    int max = a[i][1], indexmax = 1;
      |                       ^~~~~~~~
/in/foo.cc:31:23: warning: variable 'indexmin' set but not used [-Wunused-but-set-variable]
   31 |    int min = a[1][j], indexmin = 1;
      |                       ^~~~~~~~