foo.c:1:1: warning: data definition has no type or storage class
    1 | n = int(input('请输入n: '))
      | ^
foo.c:1:1: warning: type defaults to 'int' in declaration of 'n' [-Wimplicit-int]
foo.c:1:5: error: expected expression before 'int'
    1 | n = int(input('请输入n: '))
      |     ^~~
foo.c:1:15: warning: character constant too long for its type
    1 | n = int(input('请输入n: '))
      |               ^~~~~~~~~~~
foo.c:5:19: error: empty character constant
    5 | print(1, 1, end = '')
      |                   ^~
foo.c:9:9: error: empty character constant
    9 |   print('', a + b, end = '')
      |         ^~
foo.c:9:26: error: empty character constant
    9 |   print('', a + b, end = '')
      |                          ^~

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