Educational Codeforces Round 53 [Rated for Div. 2]
Difference between en4 and en5, changed 2,647 character(s)
On [contest_time:1073] [contest:1073] will start.↵
 ↵
Series of Educational Rounds continue being held as [Harbour.Space University](https://harbour.space/) initiative! You can read the details about the cooperation between [Harbour.Space University](https://harbour.space/) and Codeforces in the <a href="http://codeforces.com/blog/entry/51208">blog post</a>.↵
 ↵
This round will be **rated for the participants with rating lower than 2100**. It will be held on extented ACM ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally.↵
 ↵
You will be given **7 problems** and **2 hours** to solve them.↵
 ↵
The problems were invented and prepared by Roman [user:Ajosteen,2018-10-24] Glazov, Adilbek [user:adedalic,2018-10-24] Dalabaev, Vladimir [user:Vovuh,2018-10-24] Petrov, Ivan [user:BledDest,2018-10-24] Androsov and me.↵

Good luck to all participants!↵

Our friends at Harbour.Space also have a message for you:↵

![ ](https://puu.sh/BQhMj/96b447b611.png)↵

Hey Codeforces! We want to remind you that the [Scholarship for the Master’s in Robotics](https://in.harbour.space/remy-robotics-scholarship/) programme, which starts on January 7th 2019, **has an application deadline of November 12th, 2018.**↵
 ↵
[Harbour.Space University](http://harbour.space/) and [Remy Robotics](https://www.remyrobotics.com/) are collaborating to offer graduate students from anywhere in the world a once in a lifetime opportunity, a fully funded scholarship for Harbour.Space University’s Master’s Programme in Robotics.  ↵

**The scholarship value is €34.900 and it includes:**↵

- Complete coverage of the University tuition fee (€22,900)↵

- Internship at Remy Robotics (20h per week during 1 year)↵

- €1,000 per month during 1 year (Internship earnings) ↵

**[<center>Apply here</center>](https://in.harbour.space/remy-robotics-scholarship/)**↵

UPD: [user:Vovuh,2018-10-25] and me will be waiting for you on the [community Discord server](https://codeforces.com/blog/entry/52778) shortly after the contest to discuss the problems.↵

Congratulations to the winners:↵
<table class='bordertable'>↵
<tbody>↵
<tr>↵
<th>Rank</th>↵
<th>Competitor</th>↵
<th>Problems Solved</th>↵
<th>Penalty</th>↵
</tr>↵
<tr>↵
<td>1</td>↵
<td>[user:pekempey, 2018-10-25]</td>↵
<td>7</td>↵
<td>305</td>↵
</tr>↵
<tr>↵
<td>2</td>↵
<td>[user:ko_osaga, 2018-10-25]</td>↵
<td>7</td>↵
<td>578</td>↵
</tr>↵
<tr>↵
<td>3</td>↵
<td>[user:lewin, 2018-10-25]</td>↵
<td>6</td>↵
<td>216</td>↵
</tr>↵
<tr>↵
<td>4</td>↵
<td>[user:fanache99, 2018-10-25]</td>↵
<td>6</td>↵
<td>226</td>↵
</tr>↵
<tr>↵
<td>5</td>↵
<td>[user:natsugiri, 2018-10-25]</td>↵
<td>6</td>↵
<td>257</td>↵
</tr>↵
</tbody>↵
</table>↵


Congratulations to the best hackers:↵
<table class='bordertable'>↵
<tbody>↵
<tr>↵
<th>Rank</th>↵
<th>Competitor</th>↵
<th>Hack Count</th>↵
</tr>↵
<tr>↵
<td>1</td>↵
<td>[user:halyavin, 2018-10-25]</td>↵
<td><b><font color="green">238</font></b><b>:<font color="red">-15</font></b></td></td>↵
</tr>↵
<tr>↵
<td>2</td>↵
<td>[user:Laggy, 2018-10-25]</td>↵
<td><b><font color="green">64</font></b><b>:<font color="red">-14</font></b></td></td>↵
</tr>↵
<tr>↵
<td>3</td>↵
<td>[user:Marcosk, 2018-10-25]</td>↵
<td><b><font color="green">59</font></b><b>:<font color="red">-9</font></b></td></td>↵
</tr>↵
<tr>↵
<td>4</td>↵
<td>[user:Mistra, 2018-10-25]</td>↵
<td><b><font color="green">8</font></b><b>:<font color="red">-1</font></b></td></td>↵
</tr>↵
<tr>↵
<td>5</td>↵
<td>[user:LordVoldebug, 2018-10-25]</td>↵
<td><b><font color="green">7</font></b><b>:<font color="red">-1</font></b></td></td>↵
</tr>↵
</tbody>↵
</table>↵
482 successful hacks and 684 unsuccessful hacks were made in total!↵

And finally people who were the first to solve each problem:↵
<table class='bordertable'>↵
<tbody>↵
<tr>↵
<th>Problem</th>↵
<th>Competitor</th>↵
<th>Penalty</th>↵
</tr>↵
<tr>↵
<td>A</td>↵
<td>[user:Dalgerok, 2018-10-25]</td>↵
<td>0:01</td>↵
</tr>↵
<tr>↵
<td>B</td>↵
<td>[user:dorijanlendvaj, 2018-10-25]</td>↵
<td>0:02</td>↵
</tr>↵
<tr>↵
<td>C</td>↵
<td>[user:fanache99, 2018-10-25]</td>↵
<td>0:10</td>↵
</tr>↵
<tr>↵
<td>D</td>↵
<td>[user:bazsi700, 2018-10-25]</td>↵
<td>0:13</td>↵
</tr>↵
<tr>↵
<td>E</td>↵
<td>[user:DAyamaCTF, 2018-10-25]</td>↵
<td>0:21</td>↵
</tr>↵
<tr>↵
<td>F</td>↵
<td>[user:Noam527, 2018-10-25]</td>↵
<td>0:48</td>↵
</tr>↵
<tr>↵
<td>G</td>↵
<td>[user:ko_osaga, 2018-10-25]</td>↵
<td>0:24</td>↵
</tr>↵
</tbody>↵
</table>↵

UPD2: [Editorial is published](https://codeforces.com/blog/entry/62742)

History

 
 
 
 
Revisions
 
 
  Rev. Lang. By When Δ Comment
en5 English PikMike 2018-10-27 09:22:28 2647
ru6 Russian PikMike 2018-10-27 09:22:08 2623
en4 English PikMike 2018-10-26 17:59:37 75
ru5 Russian PikMike 2018-10-26 17:59:07 71
ru4 Russian PikMike 2018-10-25 18:09:03 175
en3 English PikMike 2018-10-25 18:07:43 189
ru3 Russian PikMike 2018-10-24 20:15:26 979
en2 English PikMike 2018-10-24 20:14:36 987 Tiny change: 'ludes:**\n- Comple' -> 'ludes:**\n\n- Comple'
en1 English PikMike 2018-10-24 16:55:58 1107 Initial revision for English translation
ru2 Russian PikMike 2018-10-24 16:55:17 0 (опубликовано)
ru1 Russian PikMike 2018-10-24 16:53:29 1255 Первая редакция (сохранено в черновиках)