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]
                 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]
             scanf("%lld%lld",&a,&b);
             ~~~~~^~~~~~~~~~~~~~~~~~

正在同步测试数据，请稍后
自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。