foo.c:1:1: warning: data definition has no type or storage class
 dis = float(input())
 ^~~
foo.c:1:1: warning: type defaults to 'int' in declaration of 'dis' [-Wimplicit-int]
foo.c:1:7: error: expected expression before 'float'
 dis = float(input())
       ^~~~~

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