foo.cc: In function 'int main()':
foo.cc:118:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  118 |     scanf("%d%d", &n, &minv);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:127:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  127 |         scanf("%s %d", op, &x);
      |         ~~~~~^~~~~~~~~~~~~~~~~

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