Swiss Olympiad in Informatics

The following participants qualified for round 2:

For the first round of the SOI 2012 we have prepared 6 tricky tasks. There are different kinds of tasks. Three of the tasks are practical tasks: You are asked to write a complete program that solves those tasks and submit the source code. For the two theoretical tasks, the focus is on mathematical aspects that are analyzed by the means of logical considerations in order to develop and write down a detailed solution. The last tasks is a creativity task that asks you to create a program that can interactively compete against the programs of other participants. The task is chosen such that it cannot be solved optimally. But note that even a simple solution scores points.

The tasks can be found here on the website.

Ideally, you should submit your program directly via the submit-form linked at each of the task-pages. Either submit the source file directly or, if it consists of multiple files, as a an archive.

If you have problems submitting, you can also send the solutions via email to round1@soi.ch (please note your full name and login-name in that case). Important: We will confirm your submissions in this case. If you don't get a confirmation try to submit again.

The maximal number of points is the same for each task.

You should submit the source code.

Please do not send binary-files, but sourcefiles only! We will not look at binary files. If possible, try to keep your solution in just one file to make evaluation easier. Your source file should have a header with the following information: Solved task, programming language, user name.

Example in C++:

/*
  Task: sample
  Lang: C++
  User: chuck
*/

A program that correctly solves all our test cases within reasonable time (seconds) will receive the maximum score. Note that these testcases are not public, so you do not know them in advance. For the time constraint we are looking at the asymptotic runtime complexity of your program. This generally means you should optimize your run time from months to seconds, but not from 4s to 3s. Moreover your programs can use memory up to a «reasonable» limit (100MB as a rough value).

• If your code is fast and correct, you will score the maximum (and no extra points can be gained from the documentation).
• If your program is correct, but slow, you will be awarded partial points depending on how slow it is (also look at partial scoring on the task sheets).
• If your program is fast but (partially) incorrect, you will score (almost) no points.

We have created a little howto in case you are asking yourself how a perfect solution of a theoretical task is supposed to look. By all means, also submit your solution if it does not comply perfectly to this guideline, you will still be able to score many points.

• HowTo (english)
• HowTo (deutsch)

You can send your solutions as Plaintext, PDF, Postscript, OpenOffice-Document, Word-Document or as a scanned image.

Your solution will be checked for correctness and completeness. For full score, we expect source code (which can also be pseudo code) and a description of the optimal solution, a «proof» of correctness as well as an estimation of time and memory complexity. Further information to those concepts can be found in the above howto files.

We provide a server program that can be used to test your programs against each other. As a part of the download we further provide mutually equivalent sample programs in many different programming languages. Those sample programs use a very simple strategy. If there is no implementation in your favorite language, you are encouraged to as for it in our forum. We will then, if possible, write a sample program in that programming language.

You should submit the source code.

A program that usually beats the sample bots gets half of all points. The second half of the points will be awarded during the creativity task tourney on SOI Day based on the ranking list. (SOI Day takes place January 14th, 2012).