foo.cc: In function 'int main()':
foo.cc:42:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf( "%lf%lf", &node[i].x, &node[i].y );  
             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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。