foo.cc: In function 'int main()':
foo.cc:45:10: warning: statement is a reference, not call, to function 'std::ios_base::sync_with_stdio' [-Waddress]
   45 |     ios::sync_with_stdio;
      |     ~~~~~^~~~~~~~~~~~~~~
foo.cc:45:10: warning: statement has no effect [-Wunused-value]

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