Project Euler Forum

I've solved a problem a few minutes ago and noticed that the 5-digit captcha had disappeared. Also on a new problem I checked, no captcha. Is this intentional?

Yes, it is quite intentional. Most users will rarely see the CAPTCHA now, but it will appear for a period of time if the system detects unusual patterns.

Nice idea!

I noticed something odd though: I usually keep the problem page open while solving it, and after some time I suspect the security check expires: before the change I got the message "wrong security check" or something. Now the page just reloads without any message and the solution is NOT submitted. Attempting to submit it again I get the usual 30 seconds alert. Waiting the 30 seconds, the solution is submitted without errors.

Thanks for checking this out.

That's very useful feedback. Thank you.

You should not have received a 30 second warning if the page had expired. I've modified the script and that shouldn't happen again.

Hello,

I'm having a lot of fun solving the problems (Thanks for these ). But today and on Friday i solved 4(?) Problems within a few hours - including some wrong answers - and then I got a captcha when entering another solution. Did I trip some anti-cheat mechanism?

If you enter too many solutions within a sort time interval the captcha will appear. Try to be more at ease when solving problems.
Entering too many solutions within a short time might point to programmatically entering solutions. That's why the captcha turns up.

hk wrote: Mon Feb 27, 2023 2:50 pm If you enter too many solutions within a sort time interval the captcha will appear.

Thank you. Checking my history on both days I've submitted 3 solutions within one hour. That was certainly to fast.

Hello all, This is my first post/reply. So, I use python notebooks to run my python codes. sometimes, I take screenshot of the problems that interest me and try to solve them when there is no electricity at my place. once the power is back, I try to answer the problems that I took note of and solved.

I was told by my friend that it might flag me as cheating and I tried to see how and what is going on with it
( honestly, I don't understand what they achieve from cheating here, the whole point is the fun of solving but anyway)

While trying to find out what is going on, I came across plenty of sites/repos for the answers of many of the problems. even the recent problems actually.

So, I was thinking, If someone is cheating, and they answer one every hour or so, how is that gonna be flagged/noted?

There have been a few days when I've solved 5 problems, once within 6.5 hours. Starting fresh, I could probably knock off a lot of the first 50 very quickly. I don't think you need to worry about being banned for submitting a handful of answers an hour apart.