foo.c: In function 'main':
foo.c:9:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&N);
     ^~~~~~~~~~~~~~
foo.c:11:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%s",M);
     ^~~~~~~~~~~~~

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

{"receive":"2020-08-11T09:06:36.009Z","handle":"2020-08-11T09:06:36.009Z","cache_start":"2020-08-11T09:06:36.017Z","read_cases":"2020-08-11T09:06:36.147Z","judge":"2020-08-11T09:06:36.150Z","done":"2020-08-11T09:06:36.314Z"}