foo.c: In function 'main':
foo.c:4:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &a, &b);
     ^~~~~~~~~~~~~~~~~~~~~~

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

{"receive":"2020-08-09T01:06:22.657Z","handle":"2020-08-09T01:06:22.657Z","cache_start":"2020-08-09T01:06:22.666Z","read_cases":"2020-08-09T01:06:22.793Z","judge":"2020-08-09T01:06:22.795Z","done":"2020-08-09T01:06:23.084Z"}