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In a programming contest, I forgot how to round numbers in Java, an I needed a 3 number rounding, so I multiplied the number by 1000, then sum 0.5 and convert it to integer so the decimal part would be gone, finally, just print the number except the 3 last digits as a string, put a period and print the other 3 digits.
I must say I'm not proud of that.5 -
Getting stuck on a problem for 1 and a half hours when you realise Python was aliased to python version 2.7 instead of 3 :(
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First story (not rant) :3
So I was asked to set problems for an online programming contest for my college (I'm a sophomore)
The participants were students from my college.
Teacher told me "make as hard as you can"
I gave it my all.
:|
1 person solved the first question. Nobody solved the other four. :|
Not sure if I should be proud or sad.
And if you're wondering - here was my first question -
Sam wants to invest in real estate. He's got X dollars to spend. He knows the expected value per square meter of a given property. He knows the coordinates of the vertices of the polygon shaped properties he's interested in.
(both the values and coordinates for each property are given in input)
Find the maximum return on investment he can get.
(answer is, basically you calculate the area of each polygonal house using half the vector cross product, multiply it with their expected value per square meter, and then apply a dynamic programming - knapsack approach)
;-; I really thought it was a nice question man. ;-; I put so much thought into others too. ;-;
Got ignored. ;-;6 -
Well, I was Always into Computers and Games and stuff and at some point, I started wondering: "why does Computer Go brrr when I Hit this Button?".
It was WinAPI C++ and I was amazed by the tons of work the programmers must have put into all this.
13 year old me was Like: "I can make a Game, cant be too hard."
It was hard.
Turns out I grabbed a Unity Version and tried Things, followed a tutorial and Made a funny jet Fighter Game (which I sadly lost).
Then an article got me into checking out Linux based systems and pentesting.
*Promptly Burns persistent Kali Live to USB Stick"
"Wow zhis koohl".
Had Lots of fun with Metasploit.
Years pass and I wrap my head around Javascript, Node, HTML and CSS, I tried making a Website, worked Out to some extent.
More years pass, we annoy our teacher so long until he opens up an arduino course at school.
He does.
We built weather stations with an ESP32 and C++ via Arduino Software, literally build 3 quadrocopter drones with remote Control and RGB lighting.
Then, Cherry on the top of everything, we win the drone flying Contest everyone gets some nice stuff.
A couple weeks later my class teacher requests me and two of my friends to come along on one of their annual teacher meetings where there are a bunch of teachers from other schools and where they discuss new technology and stuff.
We are allowed to present 3D printing, some of our past programming and some of the tech we've built.
Teachers were amazed, I had huge amounts of fun answering their questions and explaining stuff to them.
Finally done with Realschulabschluss (Middle-grade-graduation) and High school Starts.
It's great, we finally have actual CS lessons, we lesen Java now.
It's fuckton of fun and I ace all of it.
Probably the best grades I ever had in any class.
Then, in my free time, I started writing some simple programs, firstvI extended our crappy Greenfoot Marsrover Project and gave it procedural Landscape Generation (sort of), added a Power system, reactors, Iron and uranium or, refineries, all kinds of cool stuff.
After teaching myself more Java, I start making some actual projects such as "Ranchu's bag of useful and not so useful stuff", namely my OnyxLib library on my GitHub.
More time passes, more Projects are finished, I get addicted to coding, literally.
My days were literally Eat, Code, sleep, repeat.
After breaking that unhealthy cycle I fixed it with Long Breaks and Others activities in between.
In conclusion I Always wanted to know what goes on beneath the beautiful front end of the computer, found out, and it was the most amazing thing ever.
I always had constant fun while coding (except for when you don't have fun) and really enjoyed it at most times.
I Just really love it.
About a year back now I noticed that I was really quite good at what I was doing and I wanted to continue learning and using my programming.
That's when I knew that shit was made for me.
...fuck that's a long read.5 -
Programming contest assignments, first level:
1. "...if you don't know how to return values from a function, you can just print them"
2. "...if you don't know how to read files, you can assume data is in global variables"
3. Required recursion
4. "...and estimate its time complexity.", "You may pre-process the data, but use at most o(n^3)", "your algorithm must use under n^3 operations"
That escalated quickly!1 -
Speed programming contest
Is this a thing... it should be.
After years of practice
I can type and code very fast with in shortcut only style
It actually impressed a
Non techy girl3 -
just found out a vulnerability in the website of the 3rd best high school in my country.
TL;DR: they had burried in some folders a c99 shell.
i am a begginer html/sql/php guy and really was looking into learning a bit here and there about them because i really like problem solving and found out ctfs mainly focus on this part of programming. i am a c++ programmer which does school contest like programming problems and i really enjoy them.
now back on topic.
with this urge to learn more web programming i said to myself what other method to learn better than real life sites! so i did just that. i first checked my school site. right click. inspect element. it seemed the site was made with wordpress. after looking more into the html code for the site i concluded all the images and files i could see on the site were from a folder on the server named 'wp-content/uploads'. i checked the folder. and here it got interesting. i did a get request on the site. saw the details. then i checked the site. bingo! there are 3 folders named '2017', '2018', '2019'. i said to myself: 'i am god.'
i could literally see all the announcements they have made from 2017-2019. and they were organised by month!!! my curiosity to see everything got me to the final destination.
with this adrenaline i thought about another site. in my city i have the 3rd most acclaimed high school in the country. what about checking their security?
so i typed the web address. looked around. again, right click, inspect element and looked around the source code. this time i was more lucky. this site is handmade!!! i was soooo happy because with my school's site i was restricted with what they have made with wordpress and i don't have much experience with it.
amd so i began looking what request the site made for the logos and other links. it seemed all the other links on the site were with this format: www.site.com/index.php?home. and i was very confused and still am. is this referencing some part of the site in the index.php file? is the whole site written inside the index.php file and with the question mark you just get to a part of the site? i don't really get it.
so nothing interesting inside the networking tab, just some stylesheets for the site's design i guess. i switched to the debugger tab and holy moly!! yes, it had that tree structure. very familiar. just like a project inside codeblocks or something familiar with it. and then it clicked me. there was the index.php file! and there was another folder from which i've seen nothing from the network tab. i finally got a lead!! i returned in the network tab, did a request to see the spgm folder and boooom a site appeared and i saw some files and folders from 2016. there was a spgm.js file and a spgm.php file. there was a contrib, flavors, gal and lang folders. then it once again clicked me! the lang folder was las updated this year in february. so i checked the folder and there were some files named lang with the extension named after their language and these files were last updated in 2016 so i left them alone. but there was this little snitch, this little 650K file named after the name of the school's site with the extension '.php' aaaaand it was last modified this year!!!! i was so excited! i thought i found a secret and different design of the site or something completely else! i clicked it and at first i was scared there was this black/red theme going on my screen and something was a little odd. there were no school announcements or event, nononoooo. this was still a tree structured view. at the top of the site it's written '!c99Shell v. 1.0...'
this was a big nono. i saw i could acces all kinds of folders. then i switched to the normal school website and tried to access a folder i have seen named userfiles and got a 403 forbidden error. wopsie. i then switched to the c99 shell website and tried to access the userfiles folder and my boy showed all of its contents. it was nakeeed naked. like very naked. and in the userfiles folder there were all, but i mean ALL files and folders they have on the server. there were a file with the salary of each job available in the school. some announcements. there was a list with all the students which failed classes. there were folders for contests they held. it was an absolute mess and i couldn't believe it.
i stopped and looked at the monitor. what have i done? just to learn some web programming i just leaked the server of the 3rd most famous high school in my country. image a black hat which would have seriously caused more damage. currently i am writing an email to the school to updrage their security because it is reaaaaly bad.
and the journy didn't end here. i 'hacked' the site 2 days ago and just now i thought about writing an email to the school. after i found i could access the WHOLE server i searched for the real attacker so if you want to knkw how this one went let me know in the comments.
sorry for the long post, but couldn't held it anymore13 -
Did a programming contest today. Can't say I did horrible, but I didn't do very well either.
One thing I did learn though: I prefer contests where I directly compete against other people's code (bot programming contests) over "who can comprehend and type this the fastest"
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In high school my IT teacher gave marks instead of count of account on Facebook which students made for him to winning contest on social media. I and my one friend read programming books on ours own. That was sick.
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So I'm competing in a programming contest for a $10,000 scholarship. I'm very confident in my programming ability but I have no clue what to build for the competition. Anyone have any ideas for a coding project that would wow the judges?2
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