foo.cc: In function 'int main()':
foo.cc:102:10: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  102 |     fread(Buf, 1, 1 << 26, stdin);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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