I usually get input/output and submit by using cf-tools.(https://github.com/xalanq/cf-tool)
but today, I found I could not submit my solution when typed "cf submit" for submitting as usual,only to get a command message below:
""" Submit CONTEST (contest_id), problem (problem_id) Not logged. Try to login Login (usr_name)... Cannot find csrf """
Does anyone figure out what's the problem?