You can use several words in query to find by all of them at the same time. In addition, if you are lucky search understands word forms and some synonyms. It supports search by title and author. Examples:

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Results

 
 
 
 
1.
By MikeMirzayanov, 5 years ago, translation, In English
About the Round 382 Good afternoon! I've decided to share my thoughts on the round 382. Of course, it turned upset not only to me, but also to the round coordinator [user:GlebsHP,2016-11-28]. In this round the main negative feedback were caused by two problems: [problem:735D] and [problem:735C]. Regarding [problem:735D]. I do not share the criticism to this problem. In fact, to solve it would be nice to be familiar with <a href="https://en.wikipedia.org/wiki/Goldbach&apos;s_conjecture"> Goldbach's Conjecture</a> and better with <a href="https://en.wikipedia.org/wiki/Prime_number_theorem">Prime Number Theorem</a>. These facts are medium-popular in the world of programming contests. Familiarity with them is useful, gives useful insight into primes. It is important: in this problem it was necessary to perform a simple, but nevertheless, additional step to find solution. It seems to me that it's okay to use problems that have a reduction to some popular and semi-popular topics. Otherwise, it is th...
in Google. * Deliberate coincidence or reuse of problems, it is a different story. And here, * Deliberate coincidence or reuse of problems, it is a different story. And here it is what

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2.
By Dalgerok, history, 3 years ago, In English
Round #532: coincidences? After round I saw some interesting links in the comments. [**Problem C**](https://codeforces.com/contest/1100/problem/C): https://www.quora.com/What-is-the-radius-of-the-circle-surrounding-a-circle-if-all-the-surrounding-circles-are-equal [**Problem F**](https://codeforces.com/contest/1100/problem/F): After understanding that you must find "subset with maximum XOR" on range from L to R, this subtask is becoming very easy to google it (e.g https://www.geeksforgeeks.org/find-maximum-subset-xor-given-set/) Actually the **SAME** problem: https://blog.csdn.net/ShadyPi/article/details/79939990 You can see many accepted submissions with this idea :| [**Problem E**](https://codeforces.com/contest/1100/problem/E): https://www.geeksforgeeks.org/assign-directions-to-edges-so-that-the-directed-graph-remains-acyclic/ the same idea to direct edges in order to topological sorting. _Thanks to [user:Rinne,2019-01-15] and [user:M_H_H_7,2019-01-15] for the links in the comments_ (htt...

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3.
By nitish_kumar_07, history, 11 months ago, In English
System just gave me surprising message about the coincidence of code and I have some claim of it contest id https://codeforces.com/contest/1407 Attention! Your solution 92278066 for the problem 1407B significantly coincides with solutions pubg_devil/92277818, nitish_kumar_07/92278066. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked. Attention! Your solution 92267660 for the problem 1407A significantly coincides with solutions pubg_devil/92267239, nitish_kumar_07/92267660. Such a coincidence is a clear rules violation. ...
System just gave me surprising message about the coincidence of code and I have some claim of it, to give some rating points. For the coincidence of same codes u can give me sme penalty points. Again i, . Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation, /92267239, nitish_kumar_07/92267660. Such a coincidence is a clear rules violation. Note, /92277818, nitish_kumar_07/92278066. Such a coincidence is a clear rules violation. Note, 1. Coinciding with my submission??? Of course, it was just a mere coincidence. 2. As i and my

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4.
By zscoder, history, 15 months ago, In English
[Tutorial] Generating Functions in Competitive Programming (Part 2) Welcome to Part 2 of my tutorial on generating functions. The [first part](https://codeforces.com/blog/entry/77468) focused on introducing generating functions to those without any background in generating functions. In this post, I will demonstrate a few applications of generating functions in CP problems. Let us start with some relatively straightforward examples. Note: Unless stated otherwise, all computations are done modulo a convenient prime (usually $998244353$). Also, $[n]$ denotes the set $\\{1,2,...,n\\}$. ### Blatant Applications in Counting Problems **Problem.** [AGC 005 Problem F](https://atcoder.jp/contests/agc005/tasks/agc005_f) You have a tree $T$ with $n$ vertices. For a subset $S$ of vertices, let $f(S)$ denote the minimum number of vertices in a subtree of $T$ which contains all vertices in $S$. For all $1 \le k \le n$, find the sum of $f(S)$ over all subsets $S$ with $|S| = k$. Constraints: $n \le 2 \cdot 10^{5}$. <spoiler summary="Solution"> First, ...
that there are only $n!$ good sequences. This cannot be coincidence, and a bijection between permutations and good

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5.
By JAMMY, history, 5 months ago, In English
Solution coincides but I think Problem A is trivial enough and the chances are higher of coincidence. Attention! Your solution 109231770 for problem 1493A significantly coincides with solutions JAMMY/109231770, singleLOOP/109233079. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked. This has happened because problem A of DIV2 rounds is trivial most of the times and the code is of 4-5 lines so it is just a coincidence that someone wrote a similar thing which I did even if you would go through a number of other submissions you would ...
of coincidence., JAMMY/109231770, singleLOOP/109233079. Such a coincidence is a clear rules violation. Note, is of 4-5 lines so it is just a coincidence that someone wrote a similar thing which I did even if you, , singleLOOP/109233079. Such a coincidence is a clear rules violation. Note that unintentional leakage

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6.
By Ayalla, history, 5 months ago, In English
Counting "bitwise pairs" with Digit DP Hello codeforces! This is my first blog written here, so I apologize if this blog is not good. Any suggestion for improvement will be welcome! ### **Example Problem:** You are given two integers ($0$ <= $l$ <= $r$ <= $10^9$) and you have to count the number of pairs ($i$, $j$) which $i$ & $j$ = 0 with $l$ <= $i$, $j$ <= $r$. Which "&" denotes the Bitiwse AND. ### **What is Digit DP?** Problems like "count the number of pairs of numbers that satisfy some condition" or "count the number of numbers that satisfy some condition" can usually be done with digit DP, depending on the constants. You can read more about digit DP at these links: [Link 1](https://codeforces.com/blog/entry/53960) [Link 2](https://www.geeksforgeeks.org/digit-dp-introduction/) In some of these problems, the DP transitions are like: "I am in a position (digit) of the number that I am building and I have some options of digits that I can put in this position". However, in this problem, we ...
[Coincidence](https://atcoder.jp/contests/abc138/tasks/abc138_f)

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7.
By hoke_t, history, 18 months ago, In English
System marks KACTL LCA code as cheating for many participants After competing today in [contest:1304], I received the following message from [user:System,2020-02-15]: _Attention!_ _Your solution [submission:71152328] for the problem 1304E significantly coincides with solutions [user:ksun48,2020-02-15]/[submission:71134293], [user:hoke_t,2020-02-15]/[submission:71152328], [user:Venia,2020-02-15]/[submission:71156816], [user:hanga97,2020-02-15]/[submission:71159069]. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your ...
]. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation, ]/[submission:71159069]. Such a coincidence is a clear rules violation. Note that unintentional leakage

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8.
By errorgorn, history, 4 weeks ago, In English
Interesting Coincidence ![ ](https://cdn.discordapp.com/attachments/752406106009239585/861099454119018516/unknown.png) <spoiler> 22722! 22722! WYSI WYFSI 22722! 22722! </spoiler>
Interesting Coincidence

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9.
By cyand1317, history, 4 years ago, In English
Codeforces Round #431 Editorial Hi, dear contestants! With the end of Codeforces Round #431 ([Div. 1](http://codeforces.com/contest/848) and [Div. 2](http://codeforces.com/contest/849)), some might be complaining behind the screen that problems are too tricky or hard, or have been struggling with some supposedly solvable problem... Yes, this time problems seem hard, but anyways, I hope they provided you with something, say rating, fun, ideas, or experience. I don't want to see anyone losing confidence because of failure (bad luck) in a single contest — please, don't do so. Here are the hints, tutorials and codes for the problems. Feel free to discuss about problems in the comments, and point out if something is incorrect or unclear. Thank you! ### [problem:849A] by [user:cyand1317,2017-09-01] <spoiler summary="Hint"> What will the whole array satisfy? Is that a sufficient condition? </spoiler> <spoiler summary="Tutorial"> [tutorial:849A] </spoiler> <spoiler summary="Model solution"> ~~~ #in...
coincidence?)

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10.
By sourabh_choudhary, history, 4 weeks ago, In English
Coincidence in Div 2 official winners. I checked the winner list of the [contest:1542] for motivation and how much they practiced to get the top rank. I noticed something peculiar about the winning accounts that almost none of them have given more than 10 contests. Then I checked some past Div 2 winners and it is almost the same in every contest eg [contest:1541] and [contest:1527]. Then I check some top-rated coders and even they started with the almost 1-2k standing/ranking. Why do you think that now the newcomers to CP are this good from the very start? or is it just my confirmation biases? P.S: I don't want to tag the people I'm talking about as it may waste their time. You can check the winners from contest announcements if you want.
Coincidence in Div 2 official winners.

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11.
By Morphy, 3 years ago, In English
CodeChef January Cook-Off 2019 [CodeChef January Cook-Off](https://www.codechef.com/COOK102) starts in ~72h ([Sunday, 20th January, 2019 at 21:30 IST](https://www.timeanddate.com/worldclock/fixedtime.html?msg=January+Cook-off+2019&iso=20190120T2130&p1=44&ah=2&am=30)). As ussual you will have 5 puzzles to solve in 150 minutes. The character of the contest is Ada &mdash; the most intuitive girl I have ever met. I challenge top coders to get full score in topcoder time. By the way, the contest clash with the north regional junior chess championship of my country, so to me seems like a notorious coincidence. ![ ](https://www.codechef.com/download/HP-CookOff-01.jpg) good fun and have luck! Contest log: - -24:00:00. Pran found a corner case on ADAROKS that I didn't contemplate, We fixed our solutions ad added more data. - 00:05:45. 28 acs for ADASCOOL in div1 and 14 in div2, [user:Atreus,2019-01-20] is leading in div1. - 00:15:00. Div2 users found the cakewalk problem, [user:stefdasca,2019-01-20]...
regional junior chess championship of my country, so to me seems like a notoriouscoincidence, to me seems like a notorious coincidence.

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12.
By ho-jo-bo-ro-lo, history, 5 years ago, In English
Sweet coincidence! First rated round for me this year and this is what I got :3 <br> ![ ](http://codeforces.com/predownloaded/f0/d8/f0d8c71898693182af9283e999a21822da1c1fd6.png)
Sweet coincidence!

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13.
By bhushanbaby, history, 6 months ago, In English
Contests Becoming More Sparse On Weekends Hey Codeforces! In the past, Codeforces would hold many of their contests on the weekend. But this month, I've observed that contests are happening less and less on weekends. In fact, the past 9 contests have all been held on weekdays. The last contest to be held on a weekend was [contest:1464], on December 20, 2020. In addition, the next two contests (Round #698 and Educational Round #103) are scheduled (once again) not on the weekend. So that makes 11 weekday contests in a row. Now, weekday contests aren't inherently bad, but many users aren't able to make contests on the weekdays, whether it be due to school, work, or simply being busy during the weekdays. Is there a reason for the lack of recent weekend contests? Is Codeforces purposely avoiding weekend contests? Do weekend contests conflict too much with other online judges? Is this a ploy to decrease participation so rounds won't become unrated? Is this all just a notorious coincidence? ![ ](https://codeforce...
Is this all just a notorious coincidence?

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14.
By skywalkert, history, 2 years ago, In English
2018 CMUT BeihangU Contest, Editorial This editorial corresponds to [contest:102114] (stage 5), which was held on Aug 6th, 2018. Moreover, this problem set was also used as Jingzhe Tang Contest 1 in Petrozavodsk Winter Camp on Jan 30th, 2019. **This post is now finished**, in which I try to elaborate on notes, solutions and maybe some data generating. Alternatively, you can refer to [an old published material](https://drive.google.com/file/d/1CFumWbNLTUEywkVDNF-LKT3SzYd1r15L/view), though I think the old English version did not explain something clearly. --- [problem:102114A] This problem requires to calculate $s$-$t$ min cut between any two vertices on a weighted cactus graph having $n$ vertices, denoted by $\mathrm{flow}(s, t)$. You need to report $\sum_{s < t}{(s \oplus t \oplus \mathrm{flow}(s, t))}$. $n \leq 10^5$, $\sum{n} \leq 10^6$, weights are $\leq 10^9$. Try to find some features of this graph. <spoiler summary="solution"> By contradiction, we can prove that for an undirected graph, each ed...
Wait, wait, wait... Does it seem like a notorious coincidence with [this problem](http

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15.
By Errichto, 6 years ago, In English
December Clash '15 on HackerEarth Hello Codeforces Community! I invite you to [December Clash 2015](https://www.hackerearth.com/december-clash-15/). It will take place [on Dec, 19-th at 9:30 MSK](http://www.timeanddate.com/worldclock/fixedtime.html?msg=December%20Clash%27%2015&iso=2015-12-19T00:30:00&p1=64). Duration is 24 hours and submitting time doesn't matter so you can start whenever you want. You will be given 5 algorithmic problems and one approximate (optimization) one. Some problems should be hard even for very strong competitors. All problems will have partial scoring (points for each test passed) and easier subtasks. Thus, everybody should find something for themselves. EDIT &mdash; Problems are not necessarily sorted by the difficulty! Each problem is worth 100 points but scoring is partial so try to pass as many tests as possible! There is no penalty for incorrect submissions. In my opinion problems are interesting and I hope you will have nice time solving them. It shouldn't be a typin...
Is it a coincidence that top6 has nicely distributed scores? Roughly, the i-th place has score

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16.
By CheaterKiller, history, 4 years ago, In English
To admins (cheater report) Hello everyone, I want to report 2 cheaters today. 2 days ago there was CF Round #395 Div2. I participated in contest also, problems were really good. Let's look [standings](http://codeforces.com/contest/764/standings). Hmm, good, 3 people solved all problems, 2 of them are Chinese. [user:ljh2000,2017-02-04] and [user:MashiroSky,2017-02-04]. Ok, I looked their profiles, saw that they are living in same place, studying in same school. Hmm, it doesn't like coincidence. Then I looked their solutions. Solutions for problem A: [user:ljh2000,2017-02-04]'s [solution](http://codeforces.com/contest/764/submission/24367006), and [user:MashiroSky,2017-02-04]'s [solution](http://codeforces.com/contest/764/submission/24365605). Looks similar, but it's easy problem, most peoples solutions looks same. Solutions for problem B: [user:ljh2000,2017-02-04]'s [solution](http://codeforces.com/contest/764/submission/24369314), [user:MashiroSky,2017-02-04]'s [solution](http://codeforces.com/contest...
that they are living in same place, studying in same school. Hmm, it doesn't likecoincidence. Then I looked, , it doesn't like coincidence. Then I looked their solutions.

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17.
By VeniVidiVici, 7 years ago, In English
Why do users make multiple accounts? I will attempt to explain why I think people do this, and hopefully start a serious examination of how to deal with the problem... ~~~~~ struct Warning{ long long story; }; ~~~~~ Label: Meet Bob. Bob has always been a pretty bright individual. Deciding that he should use his intelligence for good, Bob decided to put his skills to the test. As Bob knows, people use computers for programming. Because Bob owns a computer, he figures he must be a programmer as well. So Bob decided he was going to create the best game ever &mdash; one that would inspire a generation of children to waste their lives chasing pixels &mdash; solely with the power of his mind. Absolutely sure of how to continue, Bob promptly opened up the command prompt. This made sense to Bob because he once saw a monospaced screen in a movie where some dude hacked the government in 90 seconds. He proceeded to type in his masterpiece: ~~~~~ open a new window make the background look like trees put a guy w...
he called the numbers a week later, they were all disconnected. What a coincidence. But I digress...

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18.
By protalk, 3 years ago, In English
Well... System just gave me surprising message and I have some claim of it. I got message from my friend that my submission is unrated for previous round. And then I found that system gave me some surprises. _Attention!_ __ _Your solution 43138461 for the problem 1051D significantly coincides with solutions andy627/43138440, protalk/43138461. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties._ My submission : http://codeforces.com/contest/1051/submission/43138461 andy's submission : http://codeforces.com/contest/1051/submission/43138440 It was an accident, an...
significantly coincides with solutions andy627/43138440, protalk/43138461. Such acoincidence, with solutions andy627/43138440, protalk/43138461. Such a coincidence is a clear rules violation. Note, 1. Coinciding with my submission??? Of course, it was just a mere coincidence. 2. This solution

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19.
By I_love_Schwifty, history, 23 months ago, In English
Coincidence I think not! ![ ](https://i.imgur.com/xUAHTcR.jpg)
Coincidence I think not!

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20.
By letonge, history, 9 months ago, In English
What if top 20 coders complot? Bill Gates conspiracy theory Currently, top 10 coders have the power to display a _hidden_ message on Codeforces. This hidden message is formed by the first letter of all user names, since they are highlighted because they are all Legendary Grandmasters. You only have to read them vertically in the "Top rated" pane. Take for instance current hidden message, it's **UtBekmRyba**. Yes, I know, it doesn't have a lot of meaning. What if I tell you that first 20 coders could complot, or suffer from a notorious coincidence, in which interesting messages can be formed, take for instance the following order: 1. [user:jiangly,2020-10-22] 2. [user:Um_nik,2020-10-22] 3. [user:maroonrk,2020-10-22] 4. [user:Petr,2020-10-22] 5. [user:molamola.,2020-10-22] 6. [user:apiadu,2020-10-22] 7. [user:scott_wu,2020-10-22] 8. [user:tourist,2020-10-22] 9. [user:Egor,2020-10-22] 10. [user:Radewoosh,2020-10-22] Forming the word **jUmPmastER**, and I see no better real-world (sorry Mario) jumper than Bill Gates. Watch [thi...
What if I tell you that first 20 coders could complot, or suffer from a notoriouscoincidence

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21.
By YahiaSherif, history, 19 months ago, In English
Got acussed of copying another user's code!!! Just received the following message : Attention! Your solution 68541868 for the problem 1285D significantly coincides with solutions Hemose/68520332, YahiaSherif/68541868. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked. I the two solutions are not even close to being similar except for the Scanner which is used by most students in our University because it was implemented by a senior in our community here is the link to the Sca...
significantly coincides with solutions Hemose/68520332, YahiaSherif/68541868. Such acoincidence, , YahiaSherif/68541868. Such a coincidence is a clear rules violation. Note that unintentional

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22.
By dicfore, 3 months ago, In English
The cheating detection system sucks Now I appreciate the effort you guys are putting into preventing cheating. I cannot find a way to prove my innocence ,furthermore I don't think he copied my solution, since he solved both problems before me. I actually lost points in this contest, so it worked out in my favor this time. With that being said id like my minus points back and a guarantee that such mistake won't take place again. Your solution 113241228 for the problem 1509B significantly coincides with solutions anish_kr_jha/113203828, dicfore/113241228. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790 Your solut...
anish_kr_jha/113203828, dicfore/113241228. Such a coincidence is a clear rules violation. Note, /113186742, dicfore/113188623. Such a coincidence is a clear rules violation. Note that unintentional, /113203828, dicfore/113241228. Such a coincidence is a clear rules violation. Note that unintentional

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23.
By JJLeo, history, 3 months ago, In English
There is a huge misjudgment about cheating, and I was skipped in the 2050 Contest. Admins didn't reply at all, how should I do? Attention! Your solution 114011835 for the problem 1517D significantly coincides with solutions alocytus/114006714, JJLeo/114011835. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked. Here is my code [submission:114011835] and here is another guy's code [submission:114006714]. The code for 1517D is really simple, I didn't know that guy at all. This is a totally and extremely coincidence. I commented at the post "Rule about third...
alocytus/114006714, JJLeo/114011835. Such a coincidence is a clear rules violation. Note, /114006714, JJLeo/114011835. Such a coincidence is a clear rules violation. Note that unintentional, coincidence. I commented at the post "Rule about third-party code is changing" but no admin replied.

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24.
By skjha98, history, 3 days ago, In English
The Solution coincides with another person, whom I don't know. I got a message from 'system' that ***************************************** Attention! Your solution 123456859 for the problem 1551A significantly coincides with solutions skjha98/123456859, Nedtofigo/123472639. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked. ***************************************** My Submission is : [submission:123456859] And this is the other guy, whom I don't know at all. [user:Nedtofigo,2021...
, Nedtofigo/123472639. Such a coincidence is a clear rules violation. Note that unintentional, . It seems like a coincidence since the solution was simple that it matched almost exactly, but I have, /123456859, Nedtofigo/123472639. Such a coincidence is a clear rules violation. Note that unintentional

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25.
By riela, history, 3 years ago, In English
Is USA great again? It seems USA is excelling in recent competitions. This year USA won both IMO and IOI. Congrats James Li and [user:Benq,2018-09-14]! (note that both have chinese surnames :) ) The challenger for the world chess championship is Caruana (also from USA, although some people says that he is italian). Is USA getting great again? does the Trump administration is the cause of this notorious coincidences?

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26.
By rick_sanchez_c-137, history, 4 years ago, In English
Jury's solution proved incorrect by counter example, what if it wasnt? Wubalubadubdub! Today the jury solution for [problem A](http://codeforces.com/contest/819/problem/A) (div1a/div2c) was proved incorrect by a hack from a contestant. But what if it wasn't? Maybe this would be unnoticed by everyone. Maybe for ever. Does this mean that there are other problems such as this one in which the problematic test cases weren't found? The input in this case were pretty small, only 4 positive numbers, two of which were bounded by 12. One can only wonder about other problems, maybe with more complex test cases, maybe solved by a smaller sample of people, that are erroneously considered easy or correct. Maybe the outputs are correct for the considered input bounds, but the proof in the editorial isn't. Maybe there isn't a correct proof, just the coincidence that a certain algorithm gives correct output in every case. I can only conclude that the lack of proof that competitve programming instigates can be dangerous. When someone fails to solve a pr...
proof, just the coincidence that a certain algorithm gives correct output in every case.

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27.
By pa14, history, 13 months ago, In English
Regarding Solution Matching.......... Regarding: Educational Codeforces Round 90. Your solution 85007735 for the problem 1373A significantly coincides with solutions d_psypher/85007675, pa14/85007735, aman_coder1/85008198, jcnee/85008279, testmac11/85011351. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked. I'm a newbie and have just started competitive programming just few weeks ago. It's very pathetic to know from your side that you people without even examining han...
/85007675, pa14/85007735, aman_coder1/85008198, jcnee/85008279, testmac11/85011351. Such acoincidence, /85008279, testmac11/85011351. Such a coincidence is a clear rules violation. Note that unintentional

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28.
By CheaterKiller, 4 years ago, In English
WT!?? Mother of cheating!! Hello Codeforces, I want to report cheater from Codeforces Round #405 (rated, Div. 2, based on VK Cup 2017 Round 1). I want to thank authors of round too, great round! Firstly, our cheater is [user:anantheparty,2017-03-19], it is easy to see that with looking submissions for problem E ([here](http://codeforces.com/contest/791/status/E)). [user:wxh_ak,2017-03-19] named fake account sent solution in 2017-03-18 20:23:02 and [user:anantheparty,2017-03-19] sent in 2017-03-18 20:23:15, 13 second after. Hmm, you can think this is just coincidence. Let's see codes. Firstly, [anantheparty's submission](http://codeforces.com/contest/791/submission/25623078). Ok, normal code. Now we are going to see interesting part! Look [user:wxh_ak,2017-03-19]'s submission from [here](http://codeforces.com/contest/791/submission/25623055) (WARNING!! YOU CAN SCARE!!). I can feel you said WT!? :D. YES, THAT'S MOTHER OF CHEATING!!. I don't know how he did that (with program or just replacing :P) and I don't wa...
in 2017-03-18 20:23:15, 13 second after. Hmm, you can think this is just coincidence. Let's see codes

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29.
By Alilo-Sy, history, 3 years ago, In English
Why should I get punished and my solutions were skipped because someone steal my code??? I've just received a message from the System that says: "Attention! Your solution 41482612 for the problem 1020B significantly coincides with solutions missed2/41482594, Alilo-Sy/41482612. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties." And when I searched for the [user:missed2,2018-08-11] handle and look in his submissions I get shocked when I saw that his submission to [problem:1020B] [submission:41482594] is just as my submission [submission:41482612] literally. I always use ideone an...
. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation, /41482594, Alilo-Sy/41482612. Such a coincidence is a clear rules violation. Note that unintentional leakage

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