Contest

Welcome to the 13th International 24-hour Programming Contest!

Rules

The contest starts at 2012-04-27 09:00 CEST and ends at 2012-04-28 09:00 CEST.

No solution can be submitted after the 24 hour time is up.

Web server

General contest related information will be available on our web server at http://server.ch24.org/.

Submission site

The same submission system will be used as during the Electronic Contest. It will be available at http://server.ch24.org/sub/.

Task summary

There are various kinds of problems, with various scoring rules and submission methods. Here we provide a short summary:

Task	Web submission	Interactive	Score decreases with time	Penalty for wrong answer	Time delay after fail/pass	Scaling	Max score
A (Tower Defense)	Yes	No	Yes	-5	0/0	No	1000
B (Dissection)	Yes	No	No	-5	0/120s	Yes	1000
C (Laser - Lines)	Yes	No	Yes	-5	0/0	No	1000
D (Laser - Cover)	Yes	No	Yes	-5	0/0	No	1000
E (Laser - Boxes)	Yes	No	No	-5	0/120s	Yes	1000
F (Laser Hole in the Wall)	Yes	Yes	Yes	0	0/0	No	2500
G (Sabotage)	Yes	No	Yes	-5	0/0	No	1000
H (Hatch)	Yes	No	Yes	-5	0/0	No	1000
I (Eye Practice)	Yes	No	No	0	0/0	Yes	0
J (Eye For-Score)	Yes	No	No	0	0/0	Yes	1000
K (Paper Boy - Delivery)	No	Yes	No	0	0/0	Yes	2500
L (Paper Boy - Agility)	No	Yes	No	0	0/0	Yes	2500
M (Dead-line)	Yes	No	No	-5	0/120s	Yes	1000
N (Zombings)	No	Yes	No	0	0/0	Yes	3500

• Web submission: A static output file must be uploaded through the submission site.
• Interactive: During the solution or the submission, either network communication or other kind of interaction is necessary.
• Score decreases with time: Submitting at the end of the contest is worth 70% of what would be awarded at the beginning.
• Penalty for wrong answer: Wrong answer gets -5 points (different value may be specified explicitly in the task description).
• Time delay after fail/pass: Duration in minutes while no new submission is accepted after a wrong/correct answer.
• Scaling: The score for this problem may change over time depending on submissions by other teams. (Note that your last submission is considered and not your best one.)

Note that the scorings of the Paper Boy and Zombings tasks have an hourly schedule, for details see the task descriptions.

Ports

Port	Task	Service description	Connection direction server <-> team
80	-	web	←
6667	-	irc	←
u4242	-	time server, UDP broadcast destination port	→
u123	-	ntp server	←
u53	-	dns server	←
u67,u68	-	dhcp server	←
u10001	KL (Paper Boy)	UDP bicycle telemetry	→
u10002	KL (Paper Boy)	UDP video stream (mjpeg)	→
u10003	KL (Paper Boy)	UDP control service	←
u20001	N (Zombings)	UDP broadcast destination port	→
20002	N (Zombings)	TCP control service	←

Ports starting with u are UDP ports.

The UDP destination ports should be opened by the teams (if they are interested in the information).

All other services are hosted on server.ch24.org.

Contact

General contest related information and data will be published on the web at http://server.ch24.org/.

Important announcements will be made on the #info irc channel and will be published on the web as well.

For general discussions and questions join the #challenge24 irc channel.

There will be separate channels for task related problems as well: #A, #B, #CDEF, #G, #H, #IJ, #KL, #M, #N.