foo.cc: In function 'long long int china()':
foo.cc:21:23: warning: variable 'd' set but not used [-Wunused-but-set-variable]
         long long m,p,d,y;
                       ^
foo.cc: In function 'int main()':
foo.cc:29:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
                   ^
foo.cc:30:56: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i=1;i<=n;i++) scanf("%lld%lld",&a[i],&b[i]);
                                                        ^

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

{"receive":"2020-05-10T14:16:05.566Z","handle":"2020-05-10T14:16:05.566Z","cache_start":"2020-05-10T14:16:05.574Z","read_cases":"2020-05-10T14:16:06.081Z","judge":"2020-05-10T14:16:06.082Z","done":"2020-05-10T14:16:06.230Z"}