Capture The Flag
View as PDFCTF stands for Capture The Flag. After all, what else could CTF stand for?
Many problems have long flavour texts that are 'interesting', 'fun to read', and 'help you understand the problem'. In this problem, we cut out the middleman and provide you with the checker directly.
from re import split as resplit
from dmoj.utils.unicode import utf8bytes
OFFSET = [REDACTED]
goal = [20, 50, 54, 68, 54, 67, 20, 58, 65, 57, 4, 67, 16]
def is_valid(s):
if len(s) != 13:
return False
for c in s:
if not (32 <= c <= 127):
return False
return True
def check(process_output, judge_output, judge_input, **kwargs):
process_lines = list(filter(None, resplit(b'[\r\n]', utf8bytes(process_output))))
if len(process_lines) != 1:
return False
s = process_lines[0] #s is a byte string
if not is_valid(s):
return False
for i in range(13):
if goal[i] + OFFSET != s[i]:
return False
return True
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