foo.cc: In function 'void miui9(int, int)':
foo.cc:31:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d",&right);
 ~~~~~^~~~~~~~~~~~~
foo.cc:36:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d",&r_op);
 ~~~~~^~~~~~~~~~~~

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自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。