foo.cc: In function 'int main()':
foo.cc:4:29: warning: unused variable 'n' [-Wunused-variable]
     long long a[11],b=0,c=0,n,i;
                             ^
foo.cc:7:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld",&a[i]);
         ~~~~~^~~~~~~~~~~~~~
foo.cc:9:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld",&b);
     ~~~~~^~~~~~~~~~~

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