/in/foo.cc: In function 'int main()':
/in/foo.cc:7:19: warning: unused variable 'sum' [-Wunused-variable]
    7 |         long long sum=0;
      |                   ^~~
/in/foo.cc:14:15: warning: 'maxa' may be used uninitialized [-Wmaybe-uninitialized]
   14 |         cout<<maxa;
      |               ^~~~
/in/foo.cc:5:17: note: 'maxa' was declared here
    5 |         int n,a,maxa;
      |                 ^~~~