/in/foo.c:1:1: error: unknown type name 'class'
    1 | class PolyLinkNode:
      | ^~~~~
/in/foo.c:1:19: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
    1 | class PolyLinkNode:
      |                   ^
/in/foo.c:3:27: error: stray '#' in program
    3 |         self.coef = coef  # 系数
      |                           ^
/in/foo.c:4:27: error: stray '#' in program
    4 |         self.exp = exp    # 指数
      |                           ^
/in/foo.c:5:27: error: stray '#' in program
    5 |         self.next = None  # 后继节点
      |                           ^
/in/foo.c:29:3: error: invalid preprocessing directive #\U00008f93\U00005165\U00005904\U00007406
   29 | # 输入处理
      |   ^~~~~~~~
/in/foo.c:34:3: error: invalid preprocessing directive #\U00006784\U00005efa\U000094fe\U00008868\U00005e76\U00006c42\U0000503c
   34 | # 构建链表并求值
      |   ^~~~~~~~~~~~~~