foo.cc: In function ‘int main()’:
foo.cc:17:28: warning: ‘cnt’ may be used uninitialized [-Wmaybe-uninitialized]
   17 |                         cnt++;
      |                         ~~~^~
foo.cc:5:35: note: ‘cnt’ was declared here
    5 |         long long a[10005],imax,n,cnt;
      |                                   ^~~