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Tips on How To Organize your Own Practice Contest

Tips on How To Organize your Own Practice Contest. 模擬練習会のすゝめ. University of Tokyo Shunsuke SOEDA 21 st November 2004. Today’s Talk. WHAT, WHO, WHY, WHEN, HOW WHAT is a practice contest WHY you should organize one WHO would like to organize one Some tips on HOW to organize one.

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Tips on How To Organize your Own Practice Contest

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  1. Tips on How To Organize your Own Practice Contest 模擬練習会のすゝめ University of Tokyo Shunsuke SOEDA 21st November 2004

  2. Today’s Talk • WHAT, WHO, WHY, WHEN, HOW • WHAT is a practice contest • WHY you should organize one • WHO would like to organize one • Some tips on HOW to organize one

  3. WHAT What is a practice contest? • To have a practice just like a real contest • Gather the teams you know • Inter colligate • Ask your friends to do judges • Prepare problems • Set up PC2

  4. WHY Why you should hold a practice contest • To switch on the contestants • Contestants feel their rivals • Get used to the PC2 system • Give them confidence

  5. WHO Who wants to hold a practice contest • Intermediate to advanced contestants • Beginners tend to lose confidence

  6. HOW Some tips on preparing a practice contest • Preparing the problems • For remote attendees

  7. HOW Some tips on preparing a practice contest • Preparing the problems • For remote attendees

  8. Preparing the problems Most time consuming part • Selected nine problems • Six from past problems • Three original problems

  9. Selecting Past Problems Six problems out of ~120 candidates • Eight ex-contestants, ~2 contests each • Avoided problems on UVA online judge • Avoided problems from past regional contest held in Japan • Problems from eastern Europe • Well thought, strict answer

  10. Original Problems Three original problems • Some new problems to let the contestants think a bit • Quite enjoyable for the problem makers as well!

  11. HOW Some tips on preparing a practice contest • Preparing the problems • For remote attendees

  12. Remote Attendance It is essential to have strong teams in your contest • Some teams willing to attend from remote • Teams online

  13. VPN + PC2 U-TOKYO (HONGO) U-TOKYO (KOMABA) REMOTE VPN ROUTER SERVER (SITE2) SERVER (SITE1) TEAM ADMIN TEAM TEAM JUDGE TEAM

  14. Problems • PC2 uses RMI • PC2 client programs send their original IP’s, instead of ones given for the VPN connection • The server cannot connect back to the client

  15. Problems U-TOKYO (HONGO) U-TOKYO (KOMABA) REMOTE VPN ROUTER 192.168.0.55 192.168.0.4 192.168.0.56 SERVER (SITE2) SERVER (SITE1) TEAM 192.168.7.13 192.168.1.1 ADMIN TEAM TEAM JUDGE TEAM

  16. Problems U-TOKYO (HONGO) U-TOKYO (KOMABA) REMOTE I am 192.168.7.13 I am 192.168.11.1 VPN ROUTER SERVER (SITE2) SERVER (SITE1) TEAM ADMIN TEAM TEAM JUDGE TEAM

  17. Problems U-TOKYO (HONGO) U-TOKYO (KOMABA) REMOTE OK, 192.168.11.1? 192.168.7.13? VPN ROUTER SERVER (SITE2) SERVER (SITE1) TEAM ADMIN TEAM TEAM JUDGE TEAM

  18. Problems: THE PACKETS ARE LOST! U-TOKYO (HONGO) U-TOKYO (KOMABA) REMOTE OK, 192.168.11.1? 192.168.7.13? VPN ROUTER SERVER (SITE2) SERVER (SITE1) TEAM ADMIN TEAM TEAM JUDGE TEAM

  19. Solution • For the server • Tell to router to send back packets to the VPN modify the routing table • For the teams • Use java.rmi.server.hostname e.g. java -Djava.security.policy=all.policy -Djava.rmi.server.hostname=192.168.0.65 pc2.client.Client

  20. Solved 192.168.11.1 Is on VPN U-TOKYO (HONGO) U-TOKYO (KOMABA) REMOTE I am 192.168.0.55 VPN ROUTER SERVER (SITE2) SERVER (SITE1) TEAM ADMIN TEAM TEAM JUDGE TEAM

  21. Balloons! • Something you just can’t do away with • Affording Helium might be a bit too much

  22. Balloons: Solution • Hang them down

  23. Balloons: Solution • qoo_ solved one problem

  24. Balloons: Solution • The same scenery

  25. Results Yet to come

  26. Acknowledgement IZUMI, Yusuke KASAHARA, Masahiro MATSUZAKI, Kiminori MIKURUBE, Dai SHIGETOMI, Rie

  27. Thank You

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