/in/foo.c:1:1: warning: data definition has no type or storage class
 n = [float(i) for i in str(input()).split()]
 ^
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'n' [-Wimplicit-int]
/in/foo.c:1:5: error: expected expression before '[' token
 n = [float(i) for i in str(input()).split()]
     ^
/in/foo.c:3:1: error: expected ',' or ';' before 'print'
 print(max([n[j] + n[j+1] for j in range(len(n)-1)]))
 ^~~~~