foo.cc: In function 'void dts::main()':
foo.cc:111:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
                 scanf("%lld%lld%lld%lld",&n,&m,&t,&p);
                 ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:117:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
                     scanf("%lld%lld%lld",&a[i],&b[i],&c[i]);
                     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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