foo.c: In function 'main':
foo.c:6:36: warning: unused variable 'x' [-Wunused-variable]
  double replace, min=100000000, i, x;
                                    ^
foo.c:7:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d%d", &a, &b, &c, &d);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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

正在同步测试数据，请稍后
{"receive":"2020-07-11T12:56:21.325Z","handle":"2020-07-11T12:56:21.325Z","cache_start":"2020-07-11T12:56:21.332Z","read_cases":"2020-07-11T12:56:21.793Z","judge":"2020-07-11T12:56:21.793Z","done":"2020-07-11T12:56:22.970Z"}