/in/foo.cc: In function 'int main()':
/in/foo.cc:6:10: warning: 'n' is used uninitialized [-Wuninitialized]
    6 |         s=n;
      |         ~^~
/in/foo.cc:5:13: note: 'n' declared here
    5 |         int n,a,s,sum=0,cnt=0;
      |             ^