foo.cc: In function 'void dts::main()':
foo.cc:25:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%lf",&n,&R);
         ~~~~~^~~~~~~~~~~~~~~
foo.cc:28:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%lf%lf",&p[i].x,&p[i].y);
             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。