foo.c:1:1: warning: data definition has no type or storage class
 a,b,c = map(int,input().split())
 ^
foo.c:1:1: warning: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
foo.c:1:3: warning: type defaults to 'int' in declaration of 'b' [-Wimplicit-int]
 a,b,c = map(int,input().split())
   ^
foo.c:1:5: warning: type defaults to 'int' in declaration of 'c' [-Wimplicit-int]
 a,b,c = map(int,input().split())
     ^
foo.c:1:9: warning: implicit declaration of function 'map' [-Wimplicit-function-declaration]
 a,b,c = map(int,input().split())
         ^~~
foo.c:1:13: error: expected expression before 'int'
 a,b,c = map(int,input().split())
             ^~~
foo.c:2:1: error: expected ',' or ';' before 'd'
 d = a*0.2+b*0.3+c*0.5
 ^
foo.c:3:7: warning: multi-character character constant [-Wmultichar]
 print('%d'%d)
       ^~~~

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