Educational Codeforces Round 67 [Rated for Div. 2]
Разница между en2 и en3, 72 символ(ов) изменены
Hello Codeforces!↵

On [contest_time:1187] [contest:1187] 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.net/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 **7 problems** and **2 hours** to solve them.↵
 ↵
The problems were invented and prepared by Roman [user:Roms,2019-06-04] Glazov, Adilbek [user:adedalic,2019-06-04] Dalabaev, Vladimir [user:Vovuh,2019-06-04] Petrov, Ivan [user:BledDest,2019-06-04] Androsov, Maksim [user:Ne0n25,2019-06-04] Mescheryakov and me. Also huge thanks to Mike [user:MikeMirzayanov,2019-06-04] Mirzayanov for great systems Polygon and Codeforces.↵

Good luck to all participants!↵

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:Radewoosh, 2019-06-30]</td>↵
<td>7</td>↵
<td>220</td>↵
</tr>↵
<tr>↵
<td>2</td>↵
<td>[user:kefaa2, 2019-06-30]</td>↵
<td>7</td>↵
<td>346</td>↵
</tr>↵
<tr>↵
<td>3</td>↵
<td>[user:wxhtxdy, 2019-06-30]</td>↵
<td>6</td>↵
<td>120</td>↵
</tr>↵
<tr>↵
<td>4</td>↵
<td>[user:square1001, 2019-06-30]</td>↵
<td>6</td>↵
<td>136</td>↵
</tr>↵
<tr>↵
<td>5</td>↵
<td>[user:HIR180, 2019-06-30]</td>↵
<td>6</td>↵
<td>153</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:2014CAIS01, 2019-06-30]</td>↵
<td><b><font color="green">76</font></b><b>:<font color="red">-1</font></b></td></td>↵
</tr>↵
<tr>↵
<td>2</td>↵
<td>[user:prateek2112, 2019-06-30]</td>↵
<td><b><font color="green">50</font></b><b>:<font color="red">-1</font></b></td></td>↵
</tr>↵
<tr>↵
<td>3</td>↵
<td>[user:takumi152, 2019-06-30]</td>↵
<td><b><font color="green">32</font></b><b>:<font color="red">-2</font></b></td></td>↵
</tr>↵
<tr>↵
<td>4</td>↵
<td>[user:Holland_Pig, 2019-06-30]</td>↵
<td><b><font color="green">28</font></b></td></td>↵
</tr>↵
<tr>↵
<td>5</td>↵
<td>[user:sysjuruo, 2019-06-30]</td>↵
<td><b><font color="green">37</font></b><b>:<font color="red">-24</font></b></td></td>↵
</tr>↵
</tbody>↵
</table>↵
1268 successful hacks and 1683 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:Geothermal, 2019-06-30]</td>↵
<td>0:01</td>↵
</tr>↵
<tr>↵
<td>B</td>↵
<td>[user:arknave, 2019-06-30]</td>↵
<td>0:02</td>↵
</tr>↵
<tr>↵
<td>C</td>↵
<td>[user:HIR180, 2019-06-30]</td>↵
<td>0:06</td>↵
</tr>↵
<tr>↵
<td>D</td>↵
<td>[user:RUSH_D_CAT, 2019-06-30]</td>↵
<td>0:22</td>↵
</tr>↵
<tr>↵
<td>E</td>↵
<td>[user:Noam527, 2019-06-30]</td>↵
<td>0:06</td>↵
</tr>↵
<tr>↵
<td>F</td>↵
<td>[user:zhoutb, 2019-06-30]</td>↵
<td>0:28</td>↵
</tr>↵
<tr>↵
<td>G</td>↵
<td>[user:Luma, 2019-06-30]</td>↵
<td>0:46</td>↵
</tr>↵
</tbody>↵
</table>


**UPD:** [Editorial is out](https://codeforces.net/blog/entry/68111)

История

 
 
 
 
Правки
 
 
  Rev. Язык Кто Когда Δ Комментарий
en3 Английский awoo 2019-07-01 19:03:31 72
ru3 Русский awoo 2019-07-01 19:03:10 74
en2 Английский awoo 2019-07-01 18:41:02 2611
ru2 Русский awoo 2019-07-01 18:40:33 2587
en1 Английский awoo 2019-06-29 16:06:56 1276 Initial revision for English translation
ru1 Русский awoo 2019-06-29 16:06:27 1397 Первая редакция (опубликовано)