foo.cc: In function 'void dts::main()':
foo.cc:75:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   75 |                 scanf("%lld",&rec[i]);
      |                 ~~~~~^~~~~~~~~~~~~~~~
foo.cc:76:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   76 |             scanf("%lld%lld",&a,&b);
      |             ~~~~~^~~~~~~~~~~~~~~~~~

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