foo.cc: In function 'void dts::main()':
foo.cc:156:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld%lld%lld",&n,&m,&q);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:166:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%lld%lld",&x,&y);
             ~~~~~^~~~~~~~~~~~~~~~~~

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