foo.cc:10:1: error: '::main' must return 'int'
   10 | void main()
      | ^~~~
foo.cc: In function 'int main()':
foo.cc:14:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   14 |   scanf("%d", &a[i]);
      |   ~~~~~^~~~~~~~~~~~~

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