foo.cc: In function 'void work()':
foo.cc:101:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&m);int id;int x,y;
  ~~~~~^~~~~~~~~
foo.cc:104:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&x,&y);add2(y,x);
   ~~~~~^~~~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:133:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s",s);
  ~~~~~^~~~~~~~
foo.cc: In function 'void work()':
foo.cc:114:4: warning: 'id' may be used uninitialized in this function [-Wmaybe-uninitialized]
    ++id;
    ^~~~

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

{"receive":"2020-08-11T09:45:48.567Z","handle":"2020-08-11T09:45:48.567Z","cache_start":"2020-08-11T09:45:48.575Z","read_cases":"2020-08-11T09:45:48.685Z","judge":"2020-08-11T09:45:48.686Z","done":"2020-08-11T09:45:50.585Z"}