foo.cc: In function 'int main()':
foo.cc:45:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d",&n);
 ~~~~~^~~~~~~~~
foo.cc:46:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 for(int i=1;i<=n;i++)scanf("%d",&s[i]),alls+=s[i];
                      ~~~~~~~~~~~~~~~~~^~~~~~~~~~~

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