foo.cc: In function ‘int main()’:
foo.cc:17:26: warning: ‘k’ may be used uninitialized [-Wmaybe-uninitialized]
   17 |                         k++;
      |                         ~^~
foo.cc:5:29: note: ‘k’ was declared here
    5 |         int a[10005],imax,n,k;
      |                             ^