Hello Codeforces!↵
↵
On [contest_time:1366] [contest:1366] 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 extended 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 **6 or 7 problems** and **2 hours** to solve them.↵
↵
The problems were invented and prepared by Roman [user:Roms,2020-06-10] Glazov, Adilbek [user:adedalic,2020-06-10] Dalabaev, Vladimir [user:vovuh,2020-06-10] Petrov, Ivan [user:BledDest,2020-06-10] Androsov, Maksim [user:Ne0n25,2020-06-10] Mescheryakov and me. Also huge thanks to Mike [user:MikeMirzayanov,2020-06-10] Mirzayanov for great systems Polygon and Codeforces.↵
↵
Good luck to all the participants!↵
↵
Our friends at Harbour.Space also have a message for you:↵
↵
<img alt="Codeforces and Harbour.Space" src="https://codeforces.com/predownloaded/22/a2/22a28b36cf74d4381eeff9aaf9787395265e1b64.png" style="float:center;height: 350px; margin: 10px; max-width:50%;"/>↵
↵
_Hey Codeforces!_ ↵
↵
_A couple of weeks ago, we had the pleasure of hosting a webinar featuring Sergey Gordeichik, CIO of the Inception Institute of Artificial Intelligence and Director of the University’s Cybersecurity Programme._ ↵
↵
_In his talk, Sergey shared his expertise and insights on how AI is being used both positively and negatively during the COVID-19 global pandemic. He touched on topics such as the ethics of using this technology, and how it was implemented during each phase of the pandemic._ ↵
↵
_We know not everyone had the chance to tune in during the webinar, so we thought you’d be interested in having a look at the slide deck of his presentation._ ↵
↵
_You can [check it out here](https://drive.google.com/file/d/18jfX7l7VETUShTzC7PhvRuzr9DzsemuZ/view)._ ↵
↵
_If this was interesting for you, let us know in the comments, and we’ll do our best to try and provide more content like this. Keep an eye out for the final two talks in [our webinar series](https://webinars.harbour.space/) — they might be of interest to you_ :) ↵
↵
_Finally, don’t forget that this July, Sergey is teaching a course on the Cybersecurity of Cloud, Big Data, and AI. The course will be 100% online, so be sure to check it out on our website if you’re interested. [Here’s the link](https://in.harbour.space/cyber-security/cybersecurity-of-cloud-big-data-and-ai-sergey-gordeychik/)._↵
↵
_That’s all from us!_ ↵
↵
_Good luck in the round, and we’ll see you soon!_↵
↵
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:ksun48, 2020-06-12]</td>↵
<td>7</td>↵
<td>188</td>↵
</tr>↵
<tr>↵
<td>2</td>↵
<td>[user:saketh, 2020-06-12]</td>↵
<td>7</td>↵
<td>264</td>↵
</tr>↵
<tr>↵
<td>3</td>↵
<td>[user:hank55663, 2020-06-12]</td>↵
<td>7</td>↵
<td>320</td>↵
</tr>↵
<tr>↵
<td>4</td>↵
<td>[user:kefaa2, 2020-06-12]</td>↵
<td>6</td>↵
<td>109</td>↵
</tr>↵
<tr>↵
<td>5</td>↵
<td>[user:Radewoosh, 2020-06-12]</td>↵
<td>6</td>↵
<td>126</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:Hakiobo, 2020-06-12]</td>↵
<td><b><font color="green">70</font></b></td>↵
</tr>↵
<tr>↵
<td>2</td>↵
<td>[user:napgod_pk, 2020-06-12]</td>↵
<td><b><font color="green">67</font></b><b>:<font color="red">-12</font></b></td>↵
</tr>↵
<tr>↵
<td>3</td>↵
<td>[user:Zaher, 2020-06-12]</td>↵
<td><b><font color="green">71</font></b><b>:<font color="red">-21</font></b></td>↵
</tr>↵
<tr>↵
<td>4</td>↵
<td>[user:VladProg, 2020-06-12]</td>↵
<td><b><font color="green">60</font></b></td>↵
</tr>↵
<tr>↵
<td>5</td>↵
<td>[user:BohdanPastuschak, 2020-06-12]</td>↵
<td><b><font color="green">62</font></b><b>:<font color="red">-26</font></b></td>↵
</tr>↵
</tbody>↵
</table>↵
↵
1115 successful hacks and 2003 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:neal, 2020-06-12]</td>↵
<td>0:00</td>↵
</tr>↵
<tr>↵
<td>B</td>↵
<td>[user:neal, 2020-06-12]</td>↵
<td>0:02</td>↵
</tr>↵
<tr>↵
<td>C</td>↵
<td>[user:ksun48, 2020-06-12]</td>↵
<td>0:05</td>↵
</tr>↵
<tr>↵
<td>D</td>↵
<td>[user:BohdanPastuschak, 2020-06-12]</td>↵
<td>0:05</td>↵
</tr>↵
<tr>↵
<td>E</td>↵
<td>[user:ksun48, 2020-06-12]</td>↵
<td>0:15</td>↵
</tr>↵
<tr>↵
<td>F</td>↵
<td>[user:kort0n, 2020-06-12]</td>↵
<td>0:51</td>↵
</tr>↵
<tr>↵
<td>G</td>↵
<td>[user:rainboy, 2020-06-12]</td>↵
<td>0:25</td>↵
</tr>↵
</tbody>↵
</table>↵
↵
**UPD:** [Editorial is out](https://codeforces.com/blog/entry/78735)
↵
On [contest_time:1366] [contest:1366] 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 extended 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 **6 or 7 problems** and **2 hours** to solve them.↵
↵
The problems were invented and prepared by Roman [user:Roms,2020-06-10] Glazov, Adilbek [user:adedalic,2020-06-10] Dalabaev, Vladimir [user:vovuh,2020-06-10] Petrov, Ivan [user:BledDest,2020-06-10] Androsov, Maksim [user:Ne0n25,2020-06-10] Mescheryakov and me. Also huge thanks to Mike [user:MikeMirzayanov,2020-06-10] Mirzayanov for great systems Polygon and Codeforces.↵
↵
Good luck to all the participants!↵
↵
Our friends at Harbour.Space also have a message for you:↵
↵
<img alt="Codeforces and Harbour.Space" src="https://codeforces.com/predownloaded/22/a2/22a28b36cf74d4381eeff9aaf9787395265e1b64.png" style="float:center;height: 350px; margin: 10px; max-width:50%;"/>↵
↵
_Hey Codeforces!_ ↵
↵
_A couple of weeks ago, we had the pleasure of hosting a webinar featuring Sergey Gordeichik, CIO of the Inception Institute of Artificial Intelligence and Director of the University’s Cybersecurity Programme._ ↵
↵
_In his talk, Sergey shared his expertise and insights on how AI is being used both positively and negatively during the COVID-19 global pandemic. He touched on topics such as the ethics of using this technology, and how it was implemented during each phase of the pandemic._ ↵
↵
_We know not everyone had the chance to tune in during the webinar, so we thought you’d be interested in having a look at the slide deck of his presentation._ ↵
↵
_You can [check it out here](https://drive.google.com/file/d/18jfX7l7VETUShTzC7PhvRuzr9DzsemuZ/view)._ ↵
↵
_If this was interesting for you, let us know in the comments, and we’ll do our best to try and provide more content like this. Keep an eye out for the final two talks in [our webinar series](https://webinars.harbour.space/) — they might be of interest to you_ :) ↵
↵
_Finally, don’t forget that this July, Sergey is teaching a course on the Cybersecurity of Cloud, Big Data, and AI. The course will be 100% online, so be sure to check it out on our website if you’re interested. [Here’s the link](https://in.harbour.space/cyber-security/cybersecurity-of-cloud-big-data-and-ai-sergey-gordeychik/)._↵
↵
_That’s all from us!_ ↵
↵
_Good luck in the round, and we’ll see you soon!_↵
↵
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:ksun48, 2020-06-12]</td>↵
<td>7</td>↵
<td>188</td>↵
</tr>↵
<tr>↵
<td>2</td>↵
<td>[user:saketh, 2020-06-12]</td>↵
<td>7</td>↵
<td>264</td>↵
</tr>↵
<tr>↵
<td>3</td>↵
<td>[user:hank55663, 2020-06-12]</td>↵
<td>7</td>↵
<td>320</td>↵
</tr>↵
<tr>↵
<td>4</td>↵
<td>[user:kefaa2, 2020-06-12]</td>↵
<td>6</td>↵
<td>109</td>↵
</tr>↵
<tr>↵
<td>5</td>↵
<td>[user:Radewoosh, 2020-06-12]</td>↵
<td>6</td>↵
<td>126</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:Hakiobo, 2020-06-12]</td>↵
<td><b><font color="green">70</font></b></td>↵
</tr>↵
<tr>↵
<td>2</td>↵
<td>[user:napgod_pk, 2020-06-12]</td>↵
<td><b><font color="green">67</font></b><b>:<font color="red">-12</font></b></td>↵
</tr>↵
<tr>↵
<td>3</td>↵
<td>[user:Zaher, 2020-06-12]</td>↵
<td><b><font color="green">71</font></b><b>:<font color="red">-21</font></b></td>↵
</tr>↵
<tr>↵
<td>4</td>↵
<td>[user:VladProg, 2020-06-12]</td>↵
<td><b><font color="green">60</font></b></td>↵
</tr>↵
<tr>↵
<td>5</td>↵
<td>[user:BohdanPastuschak, 2020-06-12]</td>↵
<td><b><font color="green">62</font></b><b>:<font color="red">-26</font></b></td>↵
</tr>↵
</tbody>↵
</table>↵
↵
1115 successful hacks and 2003 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:neal, 2020-06-12]</td>↵
<td>0:00</td>↵
</tr>↵
<tr>↵
<td>B</td>↵
<td>[user:neal, 2020-06-12]</td>↵
<td>0:02</td>↵
</tr>↵
<tr>↵
<td>C</td>↵
<td>[user:ksun48, 2020-06-12]</td>↵
<td>0:05</td>↵
</tr>↵
<tr>↵
<td>D</td>↵
<td>[user:BohdanPastuschak, 2020-06-12]</td>↵
<td>0:05</td>↵
</tr>↵
<tr>↵
<td>E</td>↵
<td>[user:ksun48, 2020-06-12]</td>↵
<td>0:15</td>↵
</tr>↵
<tr>↵
<td>F</td>↵
<td>[user:kort0n, 2020-06-12]</td>↵
<td>0:51</td>↵
</tr>↵
<tr>↵
<td>G</td>↵
<td>[user:rainboy, 2020-06-12]</td>↵
<td>0:25</td>↵
</tr>↵
</tbody>↵
</table>↵
↵
**UPD:** [Editorial is out](https://codeforces.com/blog/entry/78735)
