I am facing this problem while submitting, I am getting the message saying "SORRY YOU HAVE BEEN BLOCKED".I don't understand why this is happening, can somebody help me with this?. I can access all the question but can't submit it. [for the record I know why people get banned on cf I haven't done any of that]
UPD(img 2): this is so confusing so thing is if i randomly write anything in submission(i.e "sdjnbsbaghb")this gives me compilation error which it should but moment i submit some code with libraries and stuff it says i ma blocked!!,WHAT?? 
Auto comment: topic has been updated by moradiya84 (previous revision, new revision, compare).
I am Facing the same issue
MikeMirzayanov KAN Vladosiya geranazavr555 pls look into this.
Same. If it provides any additional information, tried submitting from public wifi and then from mobile hotspot, both failed. upd: Cloudflare Ray ID: 8b7b5c8d3e756fea
yeah. same!!. I also removed all CF extensions I thought maybe!!. I also checked whether it was a device problem or my account facing the same problem on mobile, and my friend logged-in with his account on my laptop worked just fine for him.
A particular line in your code is triggering cloudflare. I have the same issue. I found one of the offending lines, but I cannot even make a comment with that line of code. Here is a pastebin with that code: https://pastebin.com/PEGtxyVT
If your code has that line, you won't be able to submit a code, or even write a comment or a blog.
I think multiple lines are triggering the issue. I don't think I have this particular line that you mentioned
Use binary search to find the offending line in your submission :P
:)
Lines 48, 66, and 70 of your last submission of Magic Grid are causing the issue for you.
I see, The common word in those lines is "char" like kibr mentioned in his comment
That's not the only line of code though.
Even "substring" or "substr" followed by "()" will cause an issue.
def chars(): for me this line of code is causing all the problems when i removed this i works i don't know i couldn't even write the word it's char not chars
try to write "def chars():" on the comment section ... not chars but char .. i used chars cause it's not letting me write the whole thing
use mirror.codeforces.com, it works! special thanks to crystal, his method worked for me
I tried actually,I can't (＞_＜)
I have the same problem. Seems to trigger some certain keywords?