A Cypriot parody of the Heineken Logo: Hestiken!

A Cypriot parody of the Heineken Logo: Hestiken!

Hestiken (or “Χέστηκεν” [Chéstiken] in Cypriot) is a slight variation of the Greek word “Χέστηκε” [Chéstike] which means that the person mentioned pooped!


ACM ICPC – Cyprus National Competition 2019

(Cyprus Collegiate Programming Contest)

On the 8th of June, the Cyprus National ACM ICPC programming competition was held at the premises of the University of Central Lancashire – Cyprus in Pyla.

The competition was co-organized by all major academic institutions in Cyprus under the auspices of the Cyprus Computer Society. The participating Universities (in alphabetic order) were the following:

  • Cyprus University of Technology
  • European University Cyprus
  • Frederick University
  • Open University of Cyprus
  • UCLan, Cyprus
  • University of Cyprus
  • University of Nicosia

The technical aspects of the competition were held up to the standards of the International Olympiad in Informatics using an automated grading environment with live feedback for the contestants.

In total, the competition hosted 8 teams of 4 members (3 contestants and one mentor). 5 algorithmic problems were given to the contestants to solve programmatically in 3 hours. By the end of the competition all 5 problems were 100% solved by at least one team.

Thanks to the work of the Organizing Committee and especially the efforts by Dr. Josephina Antoniou the competition was successfully completed without any issues.

The first two teams with the highest overall score will represent Cyprus to the South-Eastern European Regional Contest. Specifically the two teams are the following (ordered by overall rank, members ordered alphabetically):

Adamos Ttofari, Andronikos Charalambous, Rafail Loizou

Washing Machines
Coach: Chryssis Georgiou

Christodoulos Constantinides, Chryssis Eftychiou, Constantinos Demetriou

Coach: Dimitrios Kouzapas


RankAcademic InstitutionTeam Name
1University of CyprusWashingMachines
2University of CyprusMulti-Threat
3University of Cyprusinsert_catchy_name_here
4University of CyprusCoding_Warriors
5University of CyprusTrifecta
6University of CyprusPaphos
7Cyprus University of TechnologycutOverflow
8University of Central Lancashire CyprusMAF-Lab

MTN Cyprus – Get SIM Card IMSI and MSISDN using USSD codes

Because of reasons we wanted to find the IMSI of a SIM card and the MSISDN of its connection on a phone we had in our hands.
We did not wish to install additional applications on that phone to get this information so we had to find an alternative method in getting the IMSI and the MSISDN.
Luckily for us there was a way using the USSD codes that were provided by MTN Cyprus.

Using the dialer (phone application) of our phone we typed the following two commands (one at a time) and then pressed the call (green) button.

To get the MSISDN we called:


To get the IMSI we called:


After each call a popup message would appear from the provider (MTN) showing us the information asked.


Unstructured Supplementary Service Data (USSD), sometimes referred to as “Quick Codes” or “Feature codes”, is a communications protocol used by GSM cellular telephones to communicate with the mobile network operator’s computers. USSD can be used for WAP browsing, prepaid callback service, mobile-money services, location-based content services, menu-based information services, and as part of configuring the phone on the network.



MSISDN is a number uniquely identifying a subscription in a GSM or a UMTS mobile network. Simply put, it is the mapping of the telephone number to the SIM card in a mobile/cellular phone. This abbreviation has a several interpretations, the most common one being “Mobile Station International Subscriber Directory Number”.



The International Mobile Subscriber Identity or IMSI is used to identify the user of a cellular network and is a unique identification associated with all cellular networks. It is stored as a 64 bit field and is sent by the phone to the network. It is also used for acquiring other details of the mobile in the home location register (HLR) or as locally copied in the visitor location register. To prevent eavesdroppers identifying and tracking the subscriber on the radio interface, the IMSI is sent as rarely as possible and a randomly generated TMSI is sent instead.