Hi everyone! Here are the useful links of olympiad programming. Who wishes to add own links can write me or leave a comment

 

Sites that are periodically hold online contests:

http://codeforces.ru/ Codeforces

Michael Mirzayanov’s site. Periodically hold online contests. There are analysis of some of the competitions. http://www.topcoder.com/tc Programming competitions TopCoder

Official site of TCO, TCCC, TCHS, problems archive, periodically hold online contests, tutorials, forum

http://code.google.com/codejam Google Code Jam

Yearly competition of google company

http://acm.timus.ru Timus Online Judge

Ural State University’s site. Contains the largest problems archive in Russia from different competitions on sports programming, periodically hold online contests

http://acm.sgu.ru Saratov State University Online Contester

The site of the Saratov State University. Contains problems archive, forum, periodically hold online contests, it is possible to hold virtual contests

http://neerc.ifmo.ru/school Olympiad in Informatics, Saint-Petersburg, Russia

Andrew Stankevich’s site. The official website of All-Russian team competitions in St. Petersburg, internet olympiads in Informatics. There is competitions archive, forum

http://algoprog.kz/ Algoprog - a community of good programmers and developers

The site contains problem archives with built-in test system, materials for training, forum, periodically hold online contests

http://ace.delos.com/ USA Computing Olympiad

USA Compution Olympiad - events, problems, tests, solutions, comments

http://www.usaco.org/ USA Computing Olympiad

USA Compution Olympiad - events, problems, tests, solutions, comments

http://ipsc.ksp.sk/ Internet Problem Solving Contest

Team Olympiad

http://neerc.ifmo.ru/online/ NEERC Online contest site

http://acmp.ru Programmers School

The site contains problem archives with built-in test system, materials for training, forum, periodically hold online contests

http://www.e-olimp.com/ E-Olimp

Very frequent hold online contests, huge problems archive at different levels with built-in test system

http://informatics.mccme.ru/moodle/ Distance Learning

The site contains problem archives with built-in test system, materials for training, forum, periodically hold online contests

http://uva.onlinejudge.org/ UVa Online Judge

The site contains problem archives with built-in test system, periodically hold online contests

http://www.codechef.com/ CodeChef

CodeChef is India's first, non-commercial, multi-platform online coding competition, featuring monthly contests in more than 35 different programming languages. Winners of each contest get sweet prizes, recognition from their peers and an invitation to compete at the CodeChef Cup, a live event held yearly

http://acm.pku.edu.cn/ Peking University

Chinese site. Frequently held contests. Contains a large archive of problems with built-in test system

http://acm.zju.edu.cn Zhejiang University

Chinese site. Frequently held contests. Contains a large archive of problems with built-in test system

http://acm.tju.edu.cn Tianjin University

Chinese site. Frequently held contests. You can assign virtual contests. Contains a large archive of problems with built-in test system

http://acm.hdu.edu.cn/ Hangzhou Dianzi University

Chinese site. Frequently held contests. You can assign virtual contests. Contains a large archive of problems with built-in test system

http://www.z-trening.com Z-Trening

The site contains problem archives with built-in test system, periodically hold online contests

http://hsin.hr/coci/ CROATIAN OPEN COMPETITION IN INFORMATICS

Croatian site. In the year meet 8 contests. There are analysises of some contests

http://contests.snarknews.info/ SnarkNews Programming Contests

Tournaments of SnarkNews site

 

Training sites (theory, implementation, analysis, lectures, news):

http://e-maxx.ru/ MAXimal

A good collection of algorithms and implementations

http://snarknews.info SnarkNews

News of Russian and international programming competitions, results and reviews of contests, SnarkNews Summer / Winter Series, a pilot server virtual contests

http://alglib.manual.ru/ ALGLIB

This multilingual collection of algorithms for solving problems in numerical analysis and data processing. ALGLIB licensed under the GPL (version 2 or later, user selectable)

http://algolist.manual.ru/ Algolist - Algorithms, methods, sources
The site is devoted to algorithms and methods

http://g6prog.narod.ru/ g6prog

Analysises оf olympiad problems from Michael Gustokashin

http://intuit.ru Internet University of Computer Science
Here you will find lots of free training courses to help you gain new knowledge and enhance their professional skills with the maximum comfort for you

http://hardfire.far.ru HardFire

News, algorithms, electronic library

http://olympiads.ru Informatics Olympiad
Informatics Olympiad of Russia - events, tasks, tests, decisions, comments

http://olympiads.kz Informatics Olympiad
Informatics Olympiad of Kazakhstan - events, tasks, tests, decisions, comments

http://ioinformatics.org/ IOI

Site of International Olympiads in Informatics

 

Sites containing archives of different tasks, possibly with the built-in test system:

http://codeforces.ru/ Codeforces

Michael Mirzayanov’s site. Periodically hold online contests. There are analysis of some of the competitions.

http://www.topcoder.com/tc Programming competitions TopCoder

Official site of TCO, TCCC, TCHS, problems archive, periodically hold online contests, tutorials, forum

http://acm.mipt.ru Programming Olympiad on PhysTech
Site of the Moscow Physical-Technical Institute. Contains problems archive, training materials on algorithms and programming languages, forum

http://acm.timus.ru Timus Online Judge

Ural State University’s site. Contains the largest problems archive in Russia from different competitions on sports programming, periodically hold online contests

http://acm.sgu.ru Saratov State University Online Contester

The site of the Saratov State University. Contains problems archive, forum, periodically hold online contests, it is possible to hold virtual contests

http://neerc.ifmo.ru/school Olympiad in Informatics, Saint-Petersburg, Russia

Andrew Stankevich’s site. The official website of All-Russian team competitions in St. Petersburg, internet olympiads in Informatics. There is competitions archive, forum

http://www.informatics.ru Olympiad in Informatics
Site of Mytishi programming school - news, results of competitions, archives, library

http://olympiads.ru Informatics Olympiad
Informatics Olympiad of Russia - events, tasks, tests, decisions, comments

http://olympiads.kz Informatics Olympiad
Informatics Olympiad of Kazakhstan - events, tasks, tests, decisions, comments

http://algoprog.kz/ Algoprog - a community of good programmers and developers

The site contains problem archives with built-in test system, materials for training, forum, periodically hold online contests

http://acm.baylor.edu/icpc/ ACM International Collegiate Programming Contest

Official website of the International Team Championship among students ACM ICPC

http://ace.delos.com/ USA Computing Olympiad

USA Compution Olympiad - events, problems, tests, solutions, comments

http://www.usaco.org/ USA Computing Olympiad

USA Compution Olympiad - events, problems, tests, solutions, comments

http://ipsc.ksp.sk/ Internet Problem Solving Contest

Team olympiad

http://dl.gsu.by/ Distance Learning Belarus

First in Belorussia distance learning website. The site contains the problem archives  with built-in test system, materials for training, forum

http://acmp.ru Programmers School

The site contains problem archives with built-in test system, materials for training, forum, periodically hold online contests

http://informatics.mccme.ru/moodle/ Distance Learning

The site contains problem archives with built-in test system, materials for training, forum, periodically hold online contests

http://www.spoj.pl – SPOJ

Polish site. The site contains problem archives with built-in test system

http://www.e-olimp.com/ E-Olimp

Very frequent hold online contests, huge problems archive at different levels with built-in test system

http://uva.onlinejudge.org/ UVa Online Judge

The site contains problem archives with built-in test system, periodically hold online contests

http://www.codechef.com/ CodeChef

CodeChef is India's first, non-commercial, multi-platform online coding competition, featuring monthly contests in more than 35 different programming languages. Winners of each contest get sweet prizes, recognition from their peers and an invitation to compete at the CodeChef Cup, a live event held yearly

http://acm.pku.edu.cn/ Peking University

Chinese site. Frequently held contests. Contains a large archive of problems with built-in test system

http://acm.zju.edu.cn Zhejiang University

Chinese site. Frequently held contests. Contains a large archive of problems with built-in test system

http://acm.tju.edu.cn Tianjin University

Chinese site. Frequently held contests. You can assign virtual contests. Contains a large archive of problems with built-in test system

http://acm.hdu.edu.cn/ Hangzhou Dianzi University

Chinese site. Frequently held contests. You can assign virtual contests. Contains a large archive of problems with built-in test system

http://www.z-trening.com Z-Trening

The site contains problem archives with built-in test system, periodically hold online contests

 

Sites of summer schools and camps:

http://lksh.ru Summer Computer School
Site of the annual LKSh

http://summer-school.org.ua Summer Computer School in Sevastopol

 

Other sites:

http://paste.ubuntu.com/ Ubuntu Pastebin

Site for storing codes

http://pastie.org/ Pastie

Site for storing codes

http://ideone.com/ ideone

The site for the storage of codes can be compiled and run on a server for your input - can be very useful

 

All sites from above in one list:

http://codeforces.ru/ Codeforces

Michael Mirzayanov’s site. Periodically hold online contests. There are analysis of some of the competitions.

http://www.topcoder.com/tc Programming competitions TopCoder

Official site of TCO, TCCC, TCHS, problems archive, periodically hold online contests, tutorials, forum

http://e-maxx.ru/ MAXimal

A good collection of algorithms and implementations

http://acm.mipt.ru Programming Olympiad on PhysTech
Site of the Moscow Physical-Technical Institute. Contains problems archive, training materials on algorithms and programming languages, forum

http://acm.timus.ru Timus Online Judge

Ural State University’s site. Contains the largest problems archive in Russia from different competitions on sports programming, periodically hold online contests

http://acm.sgu.ru Saratov State University Online Contester

The site of the Saratov State University. Contains problems archive, forum, periodically hold online contests, it is possible to hold virtual contests

http://neerc.ifmo.ru/school Olympiad in Informatics, Saint-Petersburg, Russia

Andrew Stankevich’s site. The official website of All-Russian team competitions in St. Petersburg, internet olympiads in Informatics. There is competitions archive, forum

http://www.informatics.ru Olympiad in Informatics
Site of Mytishi programming school - news, results of competitions, archives, library

http://olympiads.ru Informatics Olympiad
Informatics Olympiad of Russia - events, tasks, tests, decisions, comments

http://olympiads.kz Informatics Olympiad
Informatics Olympiad of Kazakhstan - events, tasks, tests, decisions, comments

http://algoprog.kz/ Algoprog - a community of good programmers and developers

The site contains problem archives with built-in test system, materials for training, forum, periodically hold online contests

http://snarknews.info SnarkNews

News of Russian and international programming competitions, results and reviews of contests, SnarkNews Summer / Winter Series, a pilot server virtual contests

http://acm.baylor.edu/icpc/ ACM International Collegiate Programming Contest

Official website of the International Team Championship among students ACM ICPC

http://ace.delos.com/ USA Computing Olympiad

USA Compution Olympiad - events, problems, tests, solutions, comments

http://www.usaco.org/ USA Computing Olympiad

USA Compution Olympiad - events, problems, tests, solutions, comments

http://ipsc.ksp.sk/ Internet Problem Solving Contest

Team olympiad

http://dl.gsu.by/ Distance Learning Belarus

First in Belorussia distance learning website. The site contains the problem archives  with built-in test system, materials for training, forum

http://neerc.ifmo.ru/online/ NEERC Online contest site

http://alglib.manual.ru/ ALGLIB

This multilingual collection of algorithms for solving problems in numerical analysis and data processing. ALGLIB licensed under the GPL (version 2 or later, user selectable)

http://algolist.manual.ru/ Algolist - Algorithms, methods, sources
The site is devoted to algorithms and methods

http://g6prog.narod.ru/ g6prog

Analysises оf olympiad problems from Michael Gustokashin

http://acmp.ru Programmers School

The site contains problem archives with built-in test system, materials for training, forum, periodically hold online contests

http://intuit.ru Internet University of Computer Science
Here you will find lots of free training courses to help you gain new knowledge and enhance their professional skills with the maximum comfort for you

http://lksh.ru Summer Computer School
Site of the annual LKSh

http://summer-school.org.ua Summer Computer School in Sevastopol

http://hardfire.far.ru HardFire

News, algorithms, electronic library

http://informatics.mccme.ru/moodle/ Distance Learning

The site contains problem archives with built-in test system, materials for training, forum, periodically hold online contests

http://www.spoj.pl SPOJ

Polish site. The site contains problem archives with built-in test system

http://code.google.com/codejam Google Code Jam

Yearly competition of google company

http://pastie.org/ Pastie

Site for storing codes

http://ideone.com/ ideone

The site for the storage of codes can be compiled and run on a server for your input - can be very useful

http://www.e-olimp.com/ E-Olimp

Very frequent hold online contests, huge problems archive at different levels with built-in test system

http://uva.onlinejudge.org/ UVa Online Judge

The site contains problem archives with built-in test system, periodically hold online contests

http://www.codechef.com/ CodeChef

CodeChef is India's first, non-commercial, multi-platform online coding competition, featuring monthly contests in more than 35 different programming languages. Winners of each contest get sweet prizes, recognition from their peers and an invitation to compete at the CodeChef Cup, a live event held yearly

http://paste.ubuntu.com/ Ubuntu Pastebin

Site for storing codes

http://acm.pku.edu.cn/ Peking University

Chinese site. Frequently held contests. Contains a large archive of problems with built-in test system

http://acm.zju.edu.cn Zhejiang University

Chinese site. Frequently held contests. Contains a large archive of problems with built-in test system

http://acm.tju.edu.cn Tianjin University

Chinese site. Frequently held contests. You can assign virtual contests. Contains a large archive of problems with built-in test system

http://acm.hdu.edu.cn/ Hangzhou Dianzi University

Chinese site. Frequently held contests. You can assign virtual contests. Contains a large archive of problems with built-in test system

http://www.z-trening.com Z-Trening

The site contains problem archives with built-in test system, periodically hold online contests

http://hsin.hr/coci/ CROATIAN OPEN COMPETITION IN INFORMATICS

Croatian site. In the year meet 8 contests. There are analysises of some contests

http://contests.snarknews.info/ SnarkNews Programming Contests

Tournaments of SnarkNews site

http://ioinformatics.org/ IOI

Site of International Olympiads in Informatics