foo.cc: In function 'int main()':
foo.cc:130:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  130 |  scanf("%d%d%d", &c, &s, &r);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc:133:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  133 |   scanf("%d%d%d", &o[i], &d[i], &n[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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