codeforces.com Website Information

Daily Unique Visits: 61,216

Daily Page Views: 367,296

Income Per Day: $735

Estimated Value: $529,200

This website is located in Russian Federation and is using following IP address 77.234.215.195. See the complete list of popular websites hosted in Russian Federation.

codeforces.com is registered under .COM top-level domain. Please check other sites in .COM zone.

Website codeforces.com is using the following name servers:

dns1.yandex.net
dns2.yandex.net

and is probably hosted by CLOUDFLARENET - Cloudflare, Inc., US. See the full list of other websites hosted by CLOUDFLARENET - Cloudflare, Inc., US.

The highest website codeforces.com position in Alexa rank database was 23254 and the lowest rank position was 26760. Current position of codeforces.com in Alexa rank database is 23429.

Desktop speed score of codeforces.com (78/100) is better than the results of 65.98% of other sites and shows that the page desktop performance can be improved.

Mobile usability score of codeforces.com (90/100) is better than the results of 31.63% of other sites and means that the page is mobile-friendly.

Mobile speed score of codeforces.com (43/100) is better than the results of 22.8% of other sites and shows that the landing page performance on mobile devices is poor and can be improved.

codeforces.com Alexa Rank

The traffic rank is based on three months of aggregated historical traffic data from millions of Alexa Toolbar users and is a combined measure of page views and users.

codeforces.com whois

WHOIS gives you the ability to lookup any generic domains to find out the registered domain holder. WHOIS database are provided for information purposes only. It allows the public to check whether a specific domain name is still available or not and to obtain information related to the registration records of existing domain names.

Domain Name: CODEFORCES.COM
Registry Domain ID: 1551886546_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.gandi.net
Registrar URL: http://www.gandi.net
Updated Date: 2024-04-05T00:10:39Z
Creation Date: 2009-04-10T18:26:18Z
Registry Expiry Date: 2025-04-10T18:26:18Z
Registrar: Gandi SAS
Registrar IANA ID: 81
Registrar Abuse Contact Email: abuse@support.gandi.net
Registrar Abuse Contact Phone: +33.170377661
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Name Server: FRED.NS.CLOUDFLARE.COM
Name Server: JEAN.NS.CLOUDFLARE.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2024-09-10T23:44:19Z

codeforces.com server information

Servers Location

codeforces.com desktop page speed rank

Last tested: 2016-08-10

Desktop Speed Medium

78/100

codeforces.com Desktop Speed Test Quick Summary

priority - 10Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 26 blocking script resources and 23 blocking CSS resources. This causes a delay in rendering your page.

Remove render-blocking JavaScript:

http://st.codeforces.com/s/20863/js/jquery-1.8.3.js
http://st.codeforces.com/s/20863/js/prettify/prettify.js
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http://st.codeforces.com/s/20863/js/jquery.easing.min.js
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http://st.codeforces.com/s/20863/js/controls/wysiwyg.link.js
http://st.codeforces.com/s/20863/js/jquery.autocomplete.js
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http://st.codeforces.com/s/20863/css/style.css
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http://st.codeforces.com/s/20863/css/roundbox.css
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http://st.codeforces.com/s/20863/css/jquery.wysiwyg.css
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http://st.codeforces.com/s/20863/markitup/skins/markitup/style.css
http://st.codeforces.com/s/20863/markitup/sets/markdown/style.css

priority - 7Minify JavaScript

Compacting JavaScript code can save many bytes of data and speed up downloading, parsing, and execution time.

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priority - 4Enable compression

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priority - 2Leverage browser caching

Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.

Leverage browser caching for the following cacheable resources:

http://connect.facebook.net/en_EN/all.js (20 minutes)
https://mc.yandex.ru/metrika/watch.js (60 minutes)
http://www.google-analytics.com/ga.js (2 hours)
https://s31.postimg.org/doxii5fsb/image.png (2 hours)
http://codeforces.com/scripts/83053ab959b8a7e3ae94…/codeforces-options.js (24 hours)

priority - 2Optimize images

Properly formatting and compressing images can save many bytes of data.

Optimize the following images to reduce their size by 16.6KiB (32% reduction).

Losslessly compressing https://s31.postimg.org/doxii5fsb/image.png could save 16.6KiB (32% reduction).

codeforces.com Desktop Resource Breakdown

Total Resources	96
Number of Hosts	13
Static Resources	85
JavaScript Resources	31
CSS Resources	23

codeforces.com mobile page speed rank

Last tested: 2019-12-07

Mobile Speed Bad

43/100

codeforces.com Mobile Speed Test Quick Summary

priority - 94Optimize images

Properly formatting and compressing images can save many bytes of data.

Optimize the following images to reduce their size by 917.1KiB (99% reduction).

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priority - 40Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 30 blocking script resources and 24 blocking CSS resources. This causes a delay in rendering your page.

Remove render-blocking JavaScript:

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http://sta.codeforces.com/s/15880/js/jquery.wysiwyg.js
http://sta.codeforces.com/s/15880/js/controls/wysiwyg.colorpicker.js
http://sta.codeforces.com/s/15880/js/controls/wysiwyg.table.js
http://sta.codeforces.com/s/15880/js/controls/wysiwyg.image.js
http://sta.codeforces.com/s/15880/js/controls/wysiwyg.link.js
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http://sta.codeforces.com/s/15880/js/jquery.datepick.js
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http://sta.codeforces.com/s/15880/js/codeforces.js?v=20160131
http://sta.codeforces.com/s/15880/js/EventCatcher.js?v=20160131
http://sta.codeforces.com/s/15880/js/preparedVerdictFormats-en.js
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Optimize CSS Delivery of the following:

http://sta.codeforces.com/s/15880/css/font-awesome.min.css
http://fonts.googleapis.com/css?family=PT+Sans+Nar…&subset=latin,cyrillic
http://fonts.googleapis.com/css?family=Cuprum&subset=latin,cyrillic
http://sta.codeforces.com/s/15880/css/prettify.css
http://sta.codeforces.com/s/15880/css/clear.css
http://sta.codeforces.com/s/15880/css/style.css
http://sta.codeforces.com/s/15880/css/mobile.css
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http://sta.codeforces.com/s/15880/markitup/sets/markdown/style.css

priority - 8Minify JavaScript

Compacting JavaScript code can save many bytes of data and speed up downloading, parsing, and execution time.

Minify JavaScript for the following resources to reduce their size by 80.5KiB (42% reduction).

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priority - 4Leverage browser caching

Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.

Leverage browser caching for the following cacheable resources:

http://connect.facebook.net/en_US/sdk.js (20 minutes)
http://www.google-analytics.com/ga.js (2 hours)
http://codeforces.com/scripts/d24681155fcfc7ce302a…/codeforces-options.js (24 hours)
https://assets.codeforces.com/mathjax/MathJax.js?config=TeX-AMS_HTML-full (2 days)
https://assets.codeforces.com/mathjax/config/TeX-AMS_HTML-full.js?V=2.7.5 (2 days)
https://assets.codeforces.com/mathjax/jax/output/H…eX/fontdata.js?V=2.7.5 (2 days)

priority - 0Minify CSS

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priority - 0Enable compression

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codeforces.com Mobile Resource Breakdown

Total Resources	113
Number of Hosts	11
Static Resources	102
JavaScript Resources	38
CSS Resources	24

codeforces.com mobile page usability

Last tested: 2019-12-07

Mobile Usability Good

90/100

codeforces.com Mobile Usability Test Quick Summary

priority - 5Size content to viewport

The page content is too wide for the viewport, forcing the user to scroll horizontally. Size the page content to the viewport to provide a better user experience.

The page content is 1,234 CSS pixels wide, but the viewport is only 900 CSS pixels wide. The following elements fall outside the viewport:

The element <td>Participant 3</td> falls outside the viewport.
The element <td>Rating</td> falls outside the viewport.
The element <img src="/predownloaded…a6c92a163f.png"> falls outside the viewport.
The element <br> falls outside the viewport.
The element <a href="/profile/Forestryks" class="rated-user user-orange">Forestryks</a> falls outside the viewport.
The element <td>8110</td> falls outside the viewport.
The element <img src="/predownloaded…a6c92a163f.png"> falls outside the viewport.
The element <br> falls outside the viewport.
The element <a href="/profile/Unsto…leSolveMachine" class="rated-user user-orange">UnstoppableSolveMachine</a> falls outside the viewport.
The element <td>7657</td> falls outside the viewport.
The element <br> falls outside the viewport.
The element <a href="/profile/achi_basadzishvili" class="rated-user user-orange">achi_basadzishvili</a> falls outside the viewport.
The element <td>7271</td> falls outside the viewport.
The element <img src="/predownloaded…49d7bf8239.png"> falls outside the viewport.
The element <br> falls outside the viewport.
The element <a href="/profile/TheWa…eppedOutTheCar" class="rated-user user-orange">TheWayISteppedOutTheCar</a> falls outside the viewport.
The element <td>7189</td> falls outside the viewport.
The element <br> falls outside the viewport.
The element <a href="/profile/antony191" class="rated-user user-orange">antony191</a> falls outside the viewport.
The element <td>7092</td> falls outside the viewport.
The element <img src="/predownloaded…49d7bf8239.png"> falls outside the viewport.
The element <br> falls outside the viewport.
The element <a href="/profile/ismagilov.code" class="rated-user user-orange">ismagilov.code</a> falls outside the viewport.
The element <td>6912</td> falls outside the viewport.
The element <td>Rating</td> falls outside the viewport.
The element <td>8122</td> falls outside the viewport.
The element <td>8032</td> falls outside the viewport.
The element <td>7938</td> falls outside the viewport.
The element <td>7759</td> falls outside the viewport.
The element <td>7607</td> falls outside the viewport.
The element <td>7562</td> falls outside the viewport.
The element <td>7438</td> falls outside the viewport.
The element <td>7369</td> falls outside the viewport.
The element <td>7075</td> falls outside the viewport.

priority - 4Size tap targets appropriately

Some of the links/buttons on your webpage may be too small for a user to easily tap on a touchscreen. Consider making these tap targets larger to provide a better user experience.

The following tap targets are close to other nearby tap targets and may need additional spacing around them.

The tap target <a href="?locale=en"></a> and 2 others are close to other tap targets.

The tap target <a href="/profile/chemthan" class="rated-user user-red">chemthan</a> and 4 others are close to other tap targets.

The tap target <a href="#" class="attach-blogEnt…o-contest-link"></a> and 9 others are close to other tap targets.

The tap target <a href="https://codefo…ests/1264,1265">Codeforces Round #604</a> and 7 others are close to other tap targets.

The tap target <a href="https://www.ti…5&sec=0&p1=166" class="contest-time">Thursday, Dece…at 06:35UTC-8</a> and 2 others are close to other tap targets.

The tap target <a href="/profile/MikeMirzayanov" class="rated-user user-admin">MikeMirzayanov</a> is close to 1 other tap targets.

The tap target <a href="/profile/isaf27" class="rated-user user-red">isaf27</a> and 13 others are close to other tap targets.

The tap target <a href="/profile/Imperfect" class="rated-user user-blue">Imperfect</a> and 4 others are close to other tap targets.

The tap target <a href="/profile/Thuleanx" class="rated-user user-black">Thuleanx</a> and 1 others are close to other tap targets.

The tap target <a href="/blog/entry/71916">Read more »</a> and 3 others are close to other tap targets.
The tap target <a href="/contest/1264" class="notice">Codeforces Round #604 (Div. 1)</a> and 12 others are close to other tap targets.
The tap target <a href="/profile/kuviman" class="rated-user user-orange">kuviman</a> and 7 others are close to other tap targets.
The tap target <a href="/profile/NeercNews" class="rated-user user-black">NeercNews</a> is close to 1 other tap targets.
The tap target <a href="/profile/Alexvsalex" class="rated-user user-orange">Alexvsalex</a> and 1 others are close to other tap targets.
The tap target <a href="/profile/Rox" class="rated-user user-violet">Rox</a> is close to 3 other tap targets.
The tap target <a href="/profile/Lazyeval" class="rated-user user-blue">Lazyeval</a> and 1 others are close to other tap targets.
The tap target <a href="/profile/twitch.tv_wookje" class="rated-user user-violet">twitch.tv_wookje</a> and 5 others are close to other tap targets.
The tap target <a href="/profile/socketnaut" class="rated-user user-orange">socketnaut</a> is close to 2 other tap targets.
The tap target <a href="/profile/KrK" class="rated-user user-red">KrK</a> is close to 2 other tap targets.
The tap target <a href="/profile/Ne0n25" class="rated-user user-violet">Ne0n25</a> and 2 others are close to other tap targets.
The tap target <a href="/profile/MikeMirzayanov" class="rated-user user-admin">MikeMirzayanov</a> is close to 1 other tap targets.
The tap target <a href="/profile/yevhenii_kanivets" class="rated-user user-blue">yevhenii_kanivets</a> is close to 1 other tap targets.
The tap target <a href="/page/1">1</a> is close to 1 other tap targets.
The tap target <a href="/page/2">2</a> and 2 others are close to other tap targets.
The tap target <form id="u_0_1">Like</form> is close to 1 other tap targets.
The tap target <form id="u_0_1">Like</form> and 1 others are close to other tap targets.
The tap target <button id="u_0_2" type="submit" class="inlineBlock _2tga _89n_ _8j9v">Like</button> is close to 1 other tap targets.
The tap target <a href="/profile/tourist" class="rated-user user-legendary">tourist</a> and 16 others are close to other tap targets.
The tap target <a href="/ratings/organizations">Organizations</a> is close to 1 other tap targets.
The tap target <a href="/profile/antontrygubO_o" class="rated-user user-orange">antontrygubO_o</a> and 3 others are close to other tap targets.

codeforces.com HTML validation

Errors

Obsolete doctype. Expected “<!DOCTYPE html>”.

Line: 2 Column: 1 - 50
"... <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"> <html..."

Bad value “pragma” for attribute “http-equiv” on element “meta”.

Line: 25 Column: 5 - 49
"...ript> <meta http-equiv="pragma" content="no-cache"> <..."

Bad value “expires” for attribute “http-equiv” on element “meta”.

Line: 26 Column: 5 - 44
"...che"> <meta http-equiv="expires" content="-1"> <..."

Bad value “profileName” for attribute “http-equiv” on element “meta”.

Line: 27 Column: 5 - 48
"..."-1"> <meta http-equiv="profileName" content="d3"> <..."

The “charset” attribute on the “link” element is obsolete. Use an HTTP Content-Type header on the linked resource instead.

Line: 49 Column: 5 - 121
"..." /> <link rel="stylesheet" href="//st.codeforces.com/s/58771/css/font-awesome.min.css" type="text/css" charset="utf-8" /> ..." Line: 58 Column: 5 - 113
"...er--> <link rel="stylesheet" href="//st.codeforces.com/s/58771/css/prettify.css" type="text/css" charset="utf-8" /> <..." Line: 59 Column: 5 - 110
"...8" /> <link rel="stylesheet" href="//st.codeforces.com/s/58771/css/clear.css" type="text/css" charset="utf-8" /> <..." Line: 60 Column: 5 - 110
"...8" /> <link rel="stylesheet" href="//st.codeforces.com/s/58771/css/style.css" type="text/css" charset="utf-8" /> <..." Line: 61 Column: 5 - 116
"...8" /> <link rel="stylesheet" href="//st.codeforces.com/s/58771/css/ttypography.css" type="text/css" charset="utf-8" /> <..." Line: 62 Column: 5 - 122
"...8" /> <link rel="stylesheet" href="//st.codeforces.com/s/58771/css/problem-statement.css" type="text/css" charset="utf-8" /> <..." Line: 63 Column: 5 - 122
"...8" /> <link rel="stylesheet" href="//st.codeforces.com/s/58771/css/second-level-menu.css" type="text/css" charset="utf-8" /> <..." Line: 64 Column: 5 - 113
"...8" /> <link rel="stylesheet" href="//st.codeforces.com/s/58771/css/roundbox.css" type="text/css" charset="utf-8" /> <..." Line: 65 Column: 5 - 114
"...8" /> <link rel="stylesheet" href="//st.codeforces.com/s/58771/css/datatable.css" type="text/css" charset="utf-8" /> <..." Line: 66 Column: 5 - 115
"...8" /> <link rel="stylesheet" href="//st.codeforces.com/s/58771/css/table-form.css" type="text/css" charset="utf-8" /> <..." Line: 67 Column: 5 - 110
"...8" /> <link rel="stylesheet" href="//st.codeforces.com/s/58771/css/topic.css" type="text/css" charset="utf-8" /> <..." Line: 68 Column: 5 - 118
"...8" /> <link rel="stylesheet" href="//st.codeforces.com/s/58771/css/jquery.jgrowl.css" type="text/css" charset="utf-8" /> <..." Line: 69 Column: 5 - 112
"...8" /> <link rel="stylesheet" href="//st.codeforces.com/s/58771/css/facebox.css" type="text/css" charset="utf-8" /> <..." Line: 70 Column: 5 - 119
"...8" /> <link rel="stylesheet" href="//st.codeforces.com/s/58771/css/jquery.wysiwyg.css" type="text/css" charset="utf-8" /> <..." Line: 71 Column: 5 - 124
"...8" /> <link rel="stylesheet" href="//st.codeforces.com/s/58771/css/jquery.autocomplete.css" type="text/css" charset="utf-8" /> <..." Line: 72 Column: 5 - 124
"...8" /> <link rel="stylesheet" href="//st.codeforces.com/s/58771/css/codeforces.datepick.css" type="text/css" charset="utf-8" /> <..." Line: 73 Column: 5 - 113
"...8" /> <link rel="stylesheet" href="//st.codeforces.com/s/58771/css/colorbox.css" type="text/css" charset="utf-8" /> <..." Line: 74 Column: 5 - 118
"...8" /> <link rel="stylesheet" href="//st.codeforces.com/s/58771/css/jquery.drafts.css" type="text/css" charset="utf-8" /> ..." Line: 75 Column: 9 - 118
"...> <link rel="stylesheet" href="//st.codeforces.com/s/58771/css/community.css" type="text/css" charset="utf-8" /> ..." Line: 117 Column: 5 - 130
"...r--> <link rel="stylesheet" href="//st.codeforces.com/s/58771/markitup/skins/markitup/style.css" type="text/css" charset="utf-8" /> <..." Line: 118 Column: 5 - 129
"...8" /> <link rel="stylesheet" href="//st.codeforces.com/s/58771/markitup/sets/markdown/style.css" type="text/css" charset="utf-8" /> ..."

An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.

Line: 354 Column: 25 - 105
"... href="/"><img src="//st.codeforces.com/s/58771/images/codeforces-logo-with-telegram.png"/></a> ..." Line: 918 Column: 21 - 49
"... <img id="blogEntry-65489-resource-submitting-indicator" src="//st.codeforces.com/s/58771/images/indicator.gif" style="display: none;"/> ..." Line: 1003 Column: 5 - 109
"...em;"> <img src="//st.codeforces.com/s/58771/images/icons/paperclip-16x16.png" style="vertical-align: middle;"/> <span..." Line: 1006 Column: 5 - 109
"...em;"> <img src="//st.codeforces.com/s/58771/images/icons/paperclip-16x16.png" style="vertical-align: middle;"/> <span..." Line: 1196 Column: 21 - 49
"... <img id="blogEntry-65433-resource-submitting-indicator" src="//st.codeforces.com/s/58771/images/indicator.gif" style="display: none;"/> ..." Line: 1468 Column: 21 - 49
"... <img id="blogEntry-65063-resource-submitting-indicator" src="//st.codeforces.com/s/58771/images/indicator.gif" style="display: none;"/> ..." Line: 1553 Column: 5 - 109
"...em;"> <img src="//st.codeforces.com/s/58771/images/icons/paperclip-16x16.png" style="vertical-align: middle;"/> <span..." Line: 1753 Column: 21 - 49
"... <img id="blogEntry-65345-resource-submitting-indicator" src="//st.codeforces.com/s/58771/images/indicator.gif" style="display: none;"/> ..." Line: 1838 Column: 5 - 109
"...em;"> <img src="//st.codeforces.com/s/58771/images/icons/paperclip-16x16.png" style="vertical-align: middle;"/> <span..." Line: 2035 Column: 21 - 49
"... <img id="blogEntry-65308-resource-submitting-indicator" src="//st.codeforces.com/s/58771/images/indicator.gif" style="display: none;"/> ..." Line: 2120 Column: 5 - 109
"...em;"> <img src="//st.codeforces.com/s/58771/images/icons/paperclip-16x16.png" style="vertical-align: middle;"/> <span..." Line: 2304 Column: 21 - 49
"... <img id="blogEntry-65227-resource-submitting-indicator" src="//st.codeforces.com/s/58771/images/indicator.gif" style="display: none;"/> ..." Line: 2389 Column: 5 - 109
"...em;"> <img src="//st.codeforces.com/s/58771/images/icons/paperclip-16x16.png" style="vertical-align: middle;"/> <span..." Line: 2392 Column: 5 - 109
"...em;"> <img src="//st.codeforces.com/s/58771/images/icons/paperclip-16x16.png" style="vertical-align: middle;"/> <span..." Line: 2583 Column: 21 - 49
"... <img id="blogEntry-65033-resource-submitting-indicator" src="//st.codeforces.com/s/58771/images/indicator.gif" style="display: none;"/> ..." Line: 2668 Column: 5 - 109
"...em;"> <img src="//st.codeforces.com/s/58771/images/icons/paperclip-16x16.png" style="vertical-align: middle;"/> <span..." Line: 2873 Column: 21 - 49
"... <img id="blogEntry-65059-resource-submitting-indicator" src="//st.codeforces.com/s/58771/images/indicator.gif" style="display: none;"/> ..." Line: 2958 Column: 5 - 109
"...em;"> <img src="//st.codeforces.com/s/58771/images/icons/paperclip-16x16.png" style="vertical-align: middle;"/> <span..." Line: 3201 Column: 21 - 100
"... <img class="closed" src="//st.codeforces.com/s/58771/images/icons/control.png"/> ..." Line: 3204 Column: 25 - 108
"... <img class="opened" src="//st.codeforces.com/s/58771/images/icons/control-270.png"/> ..."

Attribute “home” not allowed on element “span” at this point.

Line: 425 Column: 138 - 239
"...l</a><br/><span class='countdown' home='//st.codeforces.com/s/58771' noRedirection='true' textBeforeRedirect=''><span ..." Line: 428 Column: 184 - 285
"...)</a><br/><span class='countdown' home='//st.codeforces.com/s/58771' noRedirection='true' textBeforeRedirect=''><span ..." Line: 431 Column: 184 - 285
"...)</a><br/><span class='countdown' home='//st.codeforces.com/s/58771' noRedirection='true' textBeforeRedirect=''><span ..."

Attribute “noredirection” not allowed on element “span” at this point.

Attribute “textbeforeredirect” not allowed on element “span” at this point.

Attribute “topicid” not allowed on element “div” at this point.

Line: 845 Column: 1 - 35
"...:2em;"> <div class="topic" topicId="65902"> <..." Line: 1123 Column: 1 - 35
"...:2em;"> <div class="topic" topicId="65846"> <..." Line: 1395 Column: 1 - 35
"...:2em;"> <div class="topic" topicId="65476"> <..." Line: 1679 Column: 1 - 35
"...:2em;"> <div class="topic" topicId="65758"> <..." Line: 1961 Column: 1 - 35
"...:2em;"> <div class="topic" topicId="65721"> <..." Line: 2231 Column: 1 - 35
"...:2em;"> <div class="topic" topicId="65640"> <..." Line: 2509 Column: 1 - 35
"...:2em;"> <div class="topic" topicId="65446"> <..." Line: 2800 Column: 1 - 35
"...:2em;"> <div class="topic" topicId="65472"> <..."

Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)

Line: 859 Column: 1 - 23
"...e"/></a> <style type="text/css"> ...." Line: 1137 Column: 1 - 23
"...e"/></a> <style type="text/css"> ...." Line: 1409 Column: 1 - 23
"...e"/></a> <style type="text/css"> ...." Line: 1694 Column: 1 - 23
"...e"/></a> <style type="text/css"> ...." Line: 1976 Column: 1 - 23
"...e"/></a> <style type="text/css"> ...." Line: 2245 Column: 1 - 23
"...e"/></a> <style type="text/css"> ...." Line: 2524 Column: 1 - 23
"...e"/></a> <style type="text/css"> ...." Line: 2814 Column: 1 - 23
"...e"/></a> <style type="text/css"> ...."

Element “option” without attribute “label” must not be empty.

Line: 897 Column: 51 - 59
"... selected></option> ..." Line: 1175 Column: 51 - 59
"... selected></option> ..." Line: 1447 Column: 51 - 59
"... selected></option> ..." Line: 1732 Column: 51 - 59
"... selected></option> ..." Line: 2014 Column: 51 - 59
"... selected></option> ..." Line: 2283 Column: 51 - 59
"... selected></option> ..." Line: 2562 Column: 51 - 59
"... selected></option> ..." Line: 2852 Column: 51 - 59
"... selected></option> ..."

Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)

Line: 993 Column: 13 - 44
"... <div style="margin-top:0.25em;"> ..." Line: 1271 Column: 13 - 44
"... <div style="margin-top:0.25em;"> ..." Line: 1543 Column: 13 - 44
"... <div style="margin-top:0.25em;"> ..." Line: 1828 Column: 13 - 44
"... <div style="margin-top:0.25em;"> ..." Line: 2110 Column: 13 - 44
"... <div style="margin-top:0.25em;"> ..." Line: 2379 Column: 13 - 44
"... <div style="margin-top:0.25em;"> ..." Line: 2658 Column: 13 - 44
"... <div style="margin-top:0.25em;"> ..." Line: 2948 Column: 13 - 44
"... <div style="margin-top:0.25em;"> ..."

Attribute “contestid” not allowed on element “a” at this point.

Line: 1834 Column: 221 - 399
"... start at <a class="contest-time" contestid="1118" href="https://www.timeanddate.com/worldclock/fixedtime.html?day=19&month=2&year=2019&hour=17&min=35&sec=0&p1=166"><span ..." Line: 2116 Column: 64 - 242
"...</p><p>On <a class="contest-time" contestid="1117" href="https://www.timeanddate.com/worldclock/fixedtime.html?day=18&month=2&year=2019&hour=18&min=40&sec=0&p1=166"><span ..." Line: 2664 Column: 353 - 530
"... place at <a class="contest-time" contestid="1114" href="https://www.timeanddate.com/worldclock/fixedtime.html?day=10&month=2&year=2019&hour=17&min=5&sec=0&p1=166"><span ..." Line: 2954 Column: 60 - 237
"...orrow, at <a class="contest-time" contestid="1110" href="https://www.timeanddate.com/worldclock/fixedtime.html?day=7&month=2&year=2019&hour=16&min=35&sec=0&p1=166"><span ..."

No “p” element in scope but a “p” end tag seen.

Line: 1834 Column: 4126 - 4129
"...> </table></p><p>Con..." Line: 1834 Column: 5409 - 5412
"... in total!</p><p>And..." Line: 1834 Column: 6790 - 6793
"...> </table></p><p><st..." Line: 2116 Column: 4965 - 4968
"...> </table></p><p>Con..." Line: 2116 Column: 6140 - 6143
"... in total!</p><p>And..." Line: 2116 Column: 7446 - 7449
"...> </table></p><p>UPD..."

The “font” element is obsolete. Use CSS instead.

Line: 1834 Column: 4398 - 4417
"...> <td><b><font color="green">73</fo..." Line: 1834 Column: 4435 - 4452
"...t></b><b>:<font color="red">-9</fo..." Line: 1834 Column: 4606 - 4625
"...> <td><b><font color="green">59</fo..." Line: 1834 Column: 4643 - 4660
"...t></b><b>:<font color="red">-6</fo..." Line: 1834 Column: 4818 - 4837
"...> <td><b><font color="green">28</fo..." Line: 1834 Column: 4855 - 4872
"...t></b><b>:<font color="red">-1</fo..." Line: 1834 Column: 5023 - 5042
"...> <td><b><font color="green">23</fo..." Line: 1834 Column: 5060 - 5077
"...t></b><b>:<font color="red">-6</fo..." Line: 1834 Column: 5242 - 5261
"...> <td><b><font color="green">24</fo..." Line: 1834 Column: 5279 - 5296
"...t></b><b>:<font color="red">-9</fo..." Line: 2116 Column: 5226 - 5245
"...> <td><b><font color="green">65</fo..." Line: 2116 Column: 5263 - 5280
"...t></b><b>:<font color="red">-8</fo..." Line: 2116 Column: 5452 - 5471
"...> <td><b><font color="green">23</fo..." Line: 2116 Column: 5489 - 5506
"...t></b><b>:<font color="red">-5</fo..." Line: 2116 Column: 5658 - 5677
"...> <td><b><font color="green">11</fo..." Line: 2116 Column: 5838 - 5857
"...> <td><b><font color="green">10</fo..." Line: 2116 Column: 6009 - 6028
"...> <td><b><font color="green">9</fon..."

The “center” element is obsolete. Use CSS instead.

Line: 2116 Column: 3684 - 3715
"...eps. </p> <center style="margin: 20.0px;"> <a hr..."

Element “span” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)

Line: 3075 Column: 13 - 35
"... <span class="inactive">←..."

Attribute “pageindex” not allowed on element “span” at this point.

Line: 3077 Column: 17 - 62
"... <span class="page-index active" pageIndex="1"><a hre..." Line: 3080 Column: 17 - 55
"... <span class="page-index" pageIndex="2"><a hre..." Line: 3083 Column: 17 - 55
"... <span class="page-index" pageIndex="3"><a hre..." Line: 3089 Column: 17 - 57
"... <span class="page-index" pageIndex="142"><a hre..." Line: 3092 Column: 17 - 57
"... <span class="page-index" pageIndex="143"><a hre..."

End tag for “body” seen, but there were unclosed elements.

Line: 3354 Column: 1 - 7
"...</script> </body> </htm..."

Unclosed element “div”.

Line: 339 Column: 1 - 15
"...script> <div id="body"> ..."

Warnings

The “type” attribute is unnecessary for JavaScript resources.

Line: 8 Column: 5 - 88
"...01"/> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/jquery-1.8.3.js"></scri..." Line: 9 Column: 5 - 42
"...ript> <script type="application/javascript"> ..." Line: 85 Column: - 5
"...ript> <script type="text/javascript" async src="https://assets.codeforces.com/mathjax/MathJax.js?config=TeX-AMS_HTML-full" > <..." Line: 89 Column: 5 - 93
"... --> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/prettify/prettify.js"></scri..." Line: 90 Column: 5 - 99
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/moment-with-locales.min.js"></scri..." Line: 91 Column: 5 - 86
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/pushstream.js"></scri..." Line: 92 Column: 5 - 93
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/jquery.easing.min.js"></scri..." Line: 93 Column: 5 - 95
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/jquery.lavalamp.min.js"></scri..." Line: 94 Column: 5 - 89
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/jquery.jgrowl.js"></scri..." Line: 95 Column: 5 - 88
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/jquery.swipe.js"></scri..." Line: 96 Column: 5 - 83
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/facebox.js"></scri..." Line: 97 Column: 5 - 90
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/jquery.wysiwyg.js"></scri..." Line: 98 Column: 5 - 104
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/controls/wysiwyg.colorpicker.js"></scri..." Line: 99 Column: 5 - 98
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/controls/wysiwyg.table.js"></scri..." Line: 100 Column: 5 - 98
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/controls/wysiwyg.image.js"></scri..." Line: 101 Column: 5 - 97
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/controls/wysiwyg.link.js"></scri..." Line: 102 Column: 5 - 95
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/jquery.autocomplete.js"></scri..." Line: 103 Column: 5 - 91
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/jquery.datepick.js"></scri..." Line: 104 Column: 5 - 93
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/jquery.ie6blocker.js"></scri..." Line: 105 Column: 5 - 95
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/jquery.colorbox-min.js"></scri..." Line: 106 Column: 5 - 89
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/jquery.ba-bbq.js"></scri..." Line: 107 Column: 5 - 89
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/jquery.drafts.js"></scri..." Line: 108 Column: 5 - 89
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/clipboard.min.js"></scri..." Line: 109 Column: 5 - 88
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/autosize.min.js"></scri..." Line: 110 Column: 5 - 80
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/sjcl.js"></scri..." Line: 111 Column: 5 - 108
"...ript> <script type="text/javascript" src="/scripts/57e561e412d66d5f7d1eb0d4b30df3d0/en/codeforces-options.js"></scri..." Line: 112 Column: 5 - 97
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/codeforces.js?v=20160131"></scri..." Line: 113 Column: 5 - 99
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/EventCatcher.js?v=20160131"></scri..." Line: 114 Column: 5 - 101
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/js/preparedVerdictFormats-en.js"></scri..." Line: 120 Column: 5 - 84
"..." /> <script type="text/javascript" src="//yandex.st/share/share.js" charset="utf-8"></scri..." Line: 122 Column: 5 - 97
"...ipt> <script type="text/javascript" src="//st.codeforces.com/s/58771/markitup/jquery.markitup.js"></scri..." Line: 123 Column: 5 - 99
"...ript> <script type="text/javascript" src="//st.codeforces.com/s/58771/markitup/sets/markdown/set.js"></scri..." Line: 141 Column: 1 - 31
"...ipts. --> <script type="text/javascript"> v..." Line: 154 Column: 1 - 31
"...</script> <script type="text/javascript"> i..." Line: 159 Column: 1 - 31
"...</script> <script type="text/javascript"> w..." Line: 178 Column: 5 - 35
"...ipt> <script type="text/javascript"> ..." Line: 326 Column: 1 - 31
".../script> <script type="text/javascript"> var..." Line: 402 Column: 5 - 35
"...div> <script type="text/javascript"> ..." Line: 623 Column: 5 - 35
"...div> <script type="text/javascript"> ..." Line: 646 Column: 5 - 35
".../div> <script type="text/javascript"> ..." Line: 926 Column: 1 - 31
"...> </div> <script type="text/javascript"> $..." Line: 1102 Column: 5 - 35
"...iv> <script type="text/javascript"> ..." Line: 1204 Column: 1 - 31
"...> </div> <script type="text/javascript"> $..." Line: 1374 Column: 5 - 35
"...iv> <script type="text/javascript"> ..." Line: 1476 Column: 1 - 31
"...> </div> <script type="text/javascript"> $..." Line: 1658 Column: 5 - 35
"...iv> <script type="text/javascript"> ..." Line: 1761 Column: 1 - 31
"...> </div> <script type="text/javascript"> $..." Line: 1940 Column: 5 - 35
"...iv> <script type="text/javascript"> ..." Line: 2043 Column: 1 - 31
"...> </div> <script type="text/javascript"> $..." Line: 2210 Column: 5 - 35
"...iv> <script type="text/javascript"> ..." Line: 2312 Column: 1 - 31
"...> </div> <script type="text/javascript"> $..." Line: 2488 Column: 5 - 35
"...iv> <script type="text/javascript"> ..." Line: 2591 Column: 1 - 31
"...> </div> <script type="text/javascript"> $..." Line: 2779 Column: 5 - 35
"...iv> <script type="text/javascript"> ..." Line: 2881 Column: 1 - 31
"...> </div> <script type="text/javascript"> $..." Line: 3054 Column: 5 - 35
"...iv> <script type="text/javascript"> ..." Line: 3097 Column: 5 - 35
".../div> <script type="text/javascript"> ..." Line: 3137 Column: 9 - 39
"...> <script type="text/javascript"> ..." Line: 3149 Column: 5 - 35
"...ript> <script type="text/javascript"> ..." Line: 3223 Column: 5 - 35
".../div> <script type="text/javascript"> ..." Line: 3332 Column: 9 - 46
"...> <script type="application/javascript"> ..."

The “charset” attribute on the “script” element is obsolete.

Line: 120 Column: 5 - 84
"..." /> <script type="text/javascript" src="//yandex.st/share/share.js" charset="utf-8"></scri..."

The “type” attribute for the “style” element is not needed and should be omitted.

This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.

Line: 3 Column: 51 - 6
"...4.01//EN"> <html> <head..."

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codeforces.com TRACEROUTE

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priority - 10Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 26 blocking script resources and 23 blocking CSS resources. This causes a delay in rendering your page.

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priority - 7Minify JavaScript

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priority - 40Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 30 blocking script resources and 24 blocking CSS resources. This causes a delay in rendering your page.

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codeforces.com HTML validation

Errors

Obsolete doctype. Expected “<!DOCTYPE html>”.

Bad value “pragma” for attribute “http-equiv” on element “meta”.

Bad value “expires” for attribute “http-equiv” on element “meta”.

Bad value “profileName” for attribute “http-equiv” on element “meta”.

The “charset” attribute on the “link” element is obsolete. Use an HTTP Content-Type header on the linked resource instead.

An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.

Attribute “home” not allowed on element “span” at this point.

Attribute “noredirection” not allowed on element “span” at this point.

Attribute “textbeforeredirect” not allowed on element “span” at this point.

Attribute “topicid” not allowed on element “div” at this point.

Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)

Element “option” without attribute “label” must not be empty.

Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)

Attribute “contestid” not allowed on element “a” at this point.

No “p” element in scope but a “p” end tag seen.

The “font” element is obsolete. Use CSS instead.

The “center” element is obsolete. Use CSS instead.

Element “span” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)

Attribute “pageindex” not allowed on element “span” at this point.

End tag for “body” seen, but there were unclosed elements.

Unclosed element “div”.

Warnings