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Not exactly an algorithm but certainly the most challenging I had to do was read data from a LIDAR, at almost 100MB/s (that is mega byte per second), while doing 3D object detection using a third generation embedded core i5 (can not remember if it was a 13W or 17W CPU) with only 1GB of RAM and without dropping any packets/frames/information.
The LIDAR required a dedicated gigabit Ethernet connection to the motherboard. Even a switch in the connection would mean packets were dropped. And that CPU struggled to keep up with the data rate let alone do 3D object detection.
I'm so glad that implementing path finding and object collision on top of that was not my job 
Best regards
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Can't narrow it down to one. But when I encounter them, it has the following 2 characteristics:
1) I can't remember writing it (but there's unfortunately evidence that I did)
2) It can't be discerned how it works, or ever worked.
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There's no *laughing so I don't cry* emoji for this relatable content so I improvised as best I could.
Real programmers use butterflies
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Deciphering the HL7 (Healthcare) documentation.
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find a way to compress 1 inch letters and symbols to fit on a small 2 inch tall screen with only 16K flash memory to work with
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We are seeing it a lot in QA at the moment:
"I've written this in C++, but I remembered I need it in C and I'm running out of time - convert it for me?"
"I wrote this in Python, but I need it in C++ and I don't know Python - convert it for me?"
Normally with more spelling mistakes and much worse grammar.
What planet do you have to live on to run that through your head and think "Yeah, every one'll believe that"?
The assumption seems to be that anyone who answers question must be dumber than them - because nobody with a room-temperature IQ or higher would fall for it ...
The fun bit is that it probably doesn't do exactly what their homework wants anyway, and there is zero chance they will understand it enough to fix that, even if they do test it beyond getting a clean compile. 
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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You're not the only one who's noticed that.
It baffles me that they're not going to do the work to write the code, but instead look up something that looks like it'll work then beg someone to convert it for them. It's a really demonstration of "do the least amount of work possible for a grade".
"F off!" If they're going to turn in an assignment, they're going to do some damn work to get that grade. They have to either write the app themselves or convert the code themselves, but in either case, they're going to be forced to do the damn work.
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Another thing could be to give them something that do similar enough but is written in a way, that there should be no way he could have done it at that point of the lessons, so that the teacher starts asking
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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Middle management material - delegate without having any idea what's going on. 
Real programmers use butterflies
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You nailed it with the term lazy...either too lazy to do their own work or too lazy to actually try to understand how to go about it. Unfortunately, there are those who will work for reputation points and provide them with solutions instead of sarcasm...actually, you earn points for sarcasm as well right? 
It's nothing new though. Half of the CIS students I graduated with couldn't write a program without help. I was a tutor for a while and remember helping many of them with their homework. It was often spoon feeding them the code line by line...giving them hints first trying to get them to think on their own, then getting aggravated when they didn't seem to be trying. 
"Go forth into the source" - Neal Morse
"Hope is contagious"
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kmoorevs wrote: Unfortunately, there are those who will work for reputation points and provide them with solutions instead of sarcasm...actually, you earn points for sarcasm as well right?
Well-crafted sarcasm might earn you additional rep-points from up-votes.
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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Daniel Pfeffer wrote: Well-crafted sarcasm might earn you additional rep-points from up-votes.
Shhh... don't tell it too loud...
We will now be flooded not only with poor questions but with poor attempts of sarcasm in the answers too 
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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If they were not dumb then they would know the answer. But the increase in these numbers suggests that someone somewhere has tweeted "CodeProject dummies will do your work for you".
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Richard MacCutchan wrote: But the increase in these numbers suggests that someone somewhere has tweeted "CodeProject dummies will do your work for you".
More likely they found CP via google after getting banned on stackoverflow for posting the same tripe.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, weighing all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
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The answer I've often wanted to give (but never quite had the courage to write) goes something like this:
1. Unplug your computer, screen, keyboard, mouse, and any other peripherals
2. Replace the computer, keyboard, mouse, screen etc. in their original packaging
3. Place everything in a large cardboard box, addressed to the vendor of your computer
4. Send it back for a refund, explaining that you are too stupid to use a computer
Unfortunately, we'd probably see messages in QA asking how to address a box.
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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I have asked some of them if they wanted it emailed direct to their tutor to same them the effort.
One of them said yes ...
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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I wish I actually had the time to do it, but I would like to do somone’s homework for them in such a way as to be overly complex and obscure, and obviously not written by the student.
".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013
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I spent a little time on this one[^] today. Mostly because he claims (without any evidence whatsoever) that he did part 1, which is likely horseshit. But if he fills in everything that's missing, it won't be overly complex and obscure. Instead, it'll be too clean to have been done by a student.
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Why not just name two of the variables acinonyx and jubatus?
I am sure the tutor will google what they mean 
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Is this in response to the lunatic who accused you of not knowing the answer? I laughed at that one a voted you a five.
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OriginalGriff wrote:
"I wrote this in Python ... and I don't know Python"
I always find this kind of phrases comical to say the least. They always make me laugh.
I have not read any of those QA but I wonder if some of those are not someone just trying to make others waste their time like a stupid prank.
I had a colleague do that to me once, where he requested me to help him write something convoluted and, when I delivered my version, he told me he didn't needed that for anything and just wanted to see if I would waste my time implementing something that convoluted. Never helped him again.
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So here you are:
Earlier this year, a group of bikers were riding east on Rte. 378 northwest of Myrtle Beach, SC, when they saw a girl about to jump off the Great Pee Dee River Bridge. So, they stopped.
George, their leader, a big burly man of 53, gets off his Harley, walks through a group of gawkers, past the State Trooper who was trying to talk her down off the railing, and says, “Hey, Baby, whatcha doin' up there on that railin'?”
She says tearfully, "I'm going to commit suicide!”
While he didn't want to appear "sensitive," George also didn't want to miss this "be-a-legend" opportunity either, so he asked, "Well, before you jump, Babe . . . why don't you give ol' George here your best last kiss?"
So, with no hesitation at all, she got down, leaned back over the railing and did just that . . . and it was a long, deep, lingering kiss followed immediately by another even better one.
After they breathlessly finished, George, still holding onto the girl, gets a big thumbs-up approval from his biker-buddies, the onlookers, and even the State Trooper, and then says, "Wow! That was the best kiss I have ever had! That's a real talent you're wasting there, Sugar Shorts. You could be famous if you rode with me. Why are you committing suicide?"
"My parents don't like me dressing up like a girl."
It's still unclear whether she jumped or was pushed.
Will Rogers never met me.
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A Harley motorcycle mechanic was removing a cylinder head from a motor when he spotted a well-known cardiologist in his shop.
The cardiologist was there waiting for the service manager to come and take a look at his motorcycle when the mechanic shouted across the garage, "Hey Doc, want to take a look at this?"
The cardiologist, a bit surprised walked over to where the mechanic was working.
The mechanic straightened up, wiped his hands on a rag and asked, "So Doc, look at this engine. I opened its heart, took the valves out, repaired or replaced anything damaged, and then put everything back in, and when I finished, it worked just like new. So how is it that I make $48,000 a year and you make $1.7M when you and I are doing basically the same work?
The cardiologist paused, leaned over, and then whispered to the mechanic.
"Try doing it with the engine running."
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