foo.cc: In function 'int main()':
foo.cc:47:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
                    ^
foo.cc:48:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lf%lf%lf", &a, &b, &r);
                                   ^
foo.cc:51:67: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lf%lf%lf", &card[i].x, &card[i].y, &card[i].angle);
                                                                   ^

自豪的采用 HydroJudger 进行评测(github.com/hydro-dev/HydroJudger)

{"receive":"2020-04-27T00:35:20.262Z","handle":"2020-04-27T00:35:20.262Z","cache_start":"2020-04-27T00:35:20.308Z","read_cases":"2020-04-27T00:35:21.433Z","judge":"2020-04-27T00:35:21.433Z","done":"2020-04-27T00:35:24.502Z"}