foo.cc: In function 'int main()':
foo.cc:55:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d:%d",&hour,&mine);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~
foo.cc:65:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%c",&t,&ch);
     ~~~~~^~~~~~~~~~~~~~~

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