/in/foo.c:1:1: warning: data definition has no type or storage class
 l = list(map(int,input().split(',')))
 ^
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'l' [-Wimplicit-int]
/in/foo.c:1:5: warning: implicit declaration of function 'list' [-Wimplicit-function-declaration]
 l = list(map(int,input().split(',')))
     ^~~~
/in/foo.c:1:10: warning: implicit declaration of function 'map' [-Wimplicit-function-declaration]
 l = list(map(int,input().split(',')))
          ^~~
/in/foo.c:1:14: error: expected expression before 'int'
 l = list(map(int,input().split(',')))
              ^~~
/in/foo.c:2:2: error: invalid preprocessing directive #�
 #找到最大值
  ^
/in/foo.c:3:1: error: expected ',' or ';' before 'a'
 a = max(l)
 ^