foo.cc: In function 'int main()':
foo.cc:144:13: warning: unused variable 'x' [-Wunused-variable]
         int x;
             ^
foo.cc:142:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
     ~~~~~^~~~~~~~~~~~~~
foo.cc:145:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%s",s);
         ~~~~~^~~~~~~~

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

{"receive":"2020-07-10T10:47:33.242Z","handle":"2020-07-10T10:47:33.242Z","cache_start":"2020-07-10T10:47:33.251Z","read_cases":"2020-07-10T10:47:33.379Z","judge":"2020-07-10T10:47:33.380Z","done":"2020-07-10T10:47:36.790Z"}