Sample implementations:
Welcome to my home page!
Welcome to my home page!
By Ciro Santilli:By others:
- stackoverflow.com/questions/1430757/convert-a-vectorint-to-a-string/79637760#79637760
- stackoverflow.com/questions/14070940/how-can-i-print-out-c-map-values/79637777#79637777
- stackoverflow.com/questions/2793232/c-print-out-objects-from-set/79637784#79637784
- stackoverflow.com/questions/61338240/how-to-print-the-content-of-a-nested-stdunordered-map/79637792#79637792
Cracking the coding interview 6ed problem by 
Ciro Santilli 37 Updated 2025-05-29 +Created 2025-05-26
Ciro Santilli 37 Updated 2025-05-29 +Created 2025-05-26- 1.2 Check permutation: cpp/string_is_permutation.cpp
- 1.5 One away: cpp/one_away.cpp
- 4.1 Route Between Nodes: cpp/directed_graph_size.cpp
- 4.7 Build Order: cpp/topological_sort.cpp
- 16.10 Living People: cpp/max_interval_overlaps.cpp
- 16.25 LRU Cache: cpp/lru_cache.cpp
vscode freezes or crashes when opening a large folder by Ciro Santilli 37 Updated 2025-05-29 +Created 2025-05-26
Ciro Santilli 37 Updated 2025-05-29 +Created 2025-05-26The issue appears to be that the file watcher goes out of control.
The reproduction is very simple:and now the editor GUI hangs and Ubuntu shows a popup:
mkdir mytest
cd mytest
seq 1000000 | xargs touch
code --disable-extensions .The window is not responding
Infinite duplicate pool:
Cracking the coding interview edition by Ciro Santilli 37 Updated 2025-05-29 +Created 2025-05-26
Ciro Santilli 37 Updated 2025-05-29 +Created 2025-05-26 CIA 2010 covert communication websites Split header images by Ciro Santilli 37 Updated 2025-05-29 +Created 2025-05-23
Ciro Santilli 37 Updated 2025-05-29 +Created 2025-05-23Maybe it is some kind of outdated web design thing, which they took much further in time than the average website, like the JAR.
Their websites do appear to follow common style guidelines form earlier eras, around the early 2000s notably, some legit sites that look a lot like hits:
An example:
Looking at the source code of: web.archive.org/web/20130828122833/http://euronewsonline.net/euro_bus.php we noticed an interesting comment:which presumably refers to Adobe ImageReady:A sample tutorial: people.goshen.edu/~paulmr/physix/326/imageready/slicendice.php
<!-- ImageReady Slices (enewsweather.psd) -->Adobe ImageReady was a bitmap graphics editor that was shipped with Adobe Photoshop for six years. It was available for Windows, Classic Mac OS and Mac OS X from 1998 to 2007. ImageReady was designed for web development and closely interacted with Photoshop
Some of the websites use CSS background images to populate the images, e.g. ingenuitytrendz.com has HTML:and then the CSS engineering.css does:
ingenuitytrendz.com/20110201170354/index.html: <li><a id="banner1"> </a></li>
ingenuitytrendz.com/20110201170354/index.html: <li><a id="banner2"> </a></li>
ingenuitytrendz.com/20110201170354/index.html: <li><a id="banner3"> </a></li>#banner1 { background: url(/web/20110201170405im_/http://ingenuitytrendz.com/images/banner_01.jpg) no-repeat center; }
#banner2 { background: url(/web/20110201170405im_/http://ingenuitytrendz.com/images/banner_02.jpg) no-repeat center; }
#banner3 { background: url(/web/20110201170405im_/http://ingenuitytrendz.com/images/banner_03.jpg) no-repeat center; } Updates Backing up CIA website archives for research and posterity by Ciro Santilli 37 Updated 2025-05-29 +Created 2025-05-23
Ciro Santilli 37 Updated 2025-05-29 +Created 2025-05-23I've downloaded and uploaded copies of the archives of the CIA websites as follows:
- all cqcounter screenshots where cqcounter was the best source to: github.com/cirosantilli/media/tree/master/cia-2010-covert-communication-websites/screenshots/cqcounter. That commercial website does not inspire much trust, e.g. now the main pages like cqcounter.com/site/internationalwhiskylounge.com.html were giving an error:so I'm glad to have saved their precious screenshots at a safer place.
[1114: The table 'access' is full] ( 1114 : The table 'access' is full ) - all Wayback Machine archives to: github.com/cirosantilli/cia-2010-websites-dump. The exports were done with github.com/StrawberryMaster/wayback-machine-downloader by Felipe x.com/opapeldetrouxa which is an up-to-date fork of github.com/hartator/wayback-machine-downloader and the tool seemed to work very well. I've also edited that better working fork at the top answer of: superuser.com/questions/828907/how-to-download-a-website-from-the-archive-org-wayback-machine/957298#957298
The cqcounter screenshots don't offer too much information, but having the wayback machine ones could actually reveal new fingerprints and other website information leaks.
Starting December 2004, the "Submit your favored carlson quote" of alljohnny.com was mind blowingly switched to point to https://washington.serversecured.net/~alljohnn/cgi-bin/memlog.cgi thus likely leaking the control site URL. Beauty. It previously pointed to web.archive.org/web/20040901162621/https://secure.alljohnny.com/cgi-bin/memlog.cgi
mynepalnews.com actually has several archives for a /stats path which contains HTML reports generated by Webalizer, an analytic tracker that tracks the source of incoming traffic!!! It is hard to believe that the CIA would have left that there. Particularly ridiculous is the presence of
inurl:cgi server_software at web.archive.org/web/20110204095809/http://mynepalnews.com:80/stats/usage_200805.html which is almost certainly a Google dork search, which we know is something that the Iranians used to find the websites. That search hits under /cgi-bin/check.cgi. That page is itself os some interest containing SERVER_ADMIN = mmadev@mmadev.com. web.archive.org/web/20110204095815/http://mynepalnews.com:80/stats/usage_200806.html also reveals several request IPs. Even if this is not a CIA website, there's a chance we could find the IP of the Iranian counter-intelligence in these IP list, it's mind blowing. There's lots of referrer spam too as well. Further HTML inspection however seems to show close relationship to that HTML and other confirmed hits.globaltourist.net, if is actually a hit, likely has a a 2003 archive, which would be our earliest hit archive so far.
A fun fact is that looking at the source code of: web.archive.org/web/20130828122833/http://euronewsonline.net/euro_bus.php we noticed an interesting comment:which clarifies that the CIA likely used Adobe ImageReady to cut up the images for Split header images:We also understand that the tool likely outputs the layout to HTML directly, and leaks the adobe projects filenames (.pds files) in the process.
<!-- ImageReady Slices (enewsweather.psd) -->Adobe ImageReady was a bitmap graphics editor that was shipped with Adobe Photoshop for six years. It was available for Windows, Classic Mac OS and Mac OS X from 1998 to 2007. ImageReady was designed for web development and closely interacted with Photoshop
Contains highly specialized questions in various academic fields, including mathematics. The problems are answered either with a number, or multiple choice, or free text.
Some dude recreated the antihydra on Magic: The Gathering at: aesort.com/antihydra, probably: x.com/IsaacKing314/status/1870637729375219740.
It is known that Magic: The Gathering is Turing complete, but it is cool to have a concrete specific example of an open problem in mathematics coded in it.
Screenshot of the Antihydra in Magic: The Gathering construction
. Pinned article: ourbigbook/introduction-to-the-ourbigbook-project
Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
Intro to OurBigBook
. Source. We have two killer features:
- topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculusArticles of different users are sorted by upvote within each article page. This feature is a bit like:
- a Wikipedia where each user can have their own version of each article
- a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
Figure 1. Screenshot of the "Derivative" topic page. View it live at: ourbigbook.com/go/topic/derivativeVideo 2. OurBigBook Web topics demo. Source. - local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
- to OurBigBook.com to get awesome multi-user features like topics and likes
- as HTML files to a static website, which you can host yourself for free on many external providers like GitHub Pages, and remain in full control
Figure 2. You can publish local OurBigBook lightweight markup files to either OurBigBook.com or as a static website.
Figure 3. Visual Studio Code extension installation.
Figure 5. . You can also edit articles on the Web editor without installing anything locally. Video 3. Edit locally and publish demo. Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension. 
- Infinitely deep tables of contents:
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact