Traceback (most recent call last):
  File "/nix/store/gsdd1yli1i41rgpm056qwdwcy9cx9zsc-python3-3.10.12/lib/python3.10/py_compile.py", line 144, in compile
    code = loader.source_to_code(source_bytes, dfile or file,
  File "<frozen importlib._bootstrap_external>", line 947, in source_to_code
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/w/foo.py", line 5
    f[i]=i*f[i-1]+(-1)**i;
    ^
IndentationError: expected an indented block after 'for' statement on line 4

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/nix/store/gsdd1yli1i41rgpm056qwdwcy9cx9zsc-python3-3.10.12/lib/python3.10/py_compile.py", line 150, in compile
    raise py_exc
py_compile.PyCompileError: Sorry: IndentationError: expected an indented block after 'for' statement on line 4 (foo.py, line 5)

[Hydro](https://hydro.ac)提供评测服务