What are some common programming languages used in the IOI?

The International Olympiad in Informatics (IOI) is a prestigious annual computer programming competition for secondary school students. Participants from around the world compete in the IOI by solving a series of challenging algorithmic problems using a computer.

The IOI allows contestants to use any programming language they prefer, as long as it is able to run on the competition's grading system. However, there are a few programming languages that are commonly used by contestants in the IOI. These include:

• C++
• Java
• Python
• Pascal
• C#
• Free Pascal

C++ is widely considered to be the most popular programming language used in the IOI, due to its speed and efficiency. Java and Python are also popular choices due to their ease of use and readability. Pascal is a language that was specifically designed for teaching programming, so it is often used by beginners in the competition.

It is worth noting that the IOI is not limited to these programming languages, and contestants are free to use any language that they are comfortable with. However, familiarity with one of the popular languages listed above can be an advantage, as there are often many online resources and communities available to help with programming challenges.