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Given a set of points in the plane and a maximal distance, I had to compute how many connexes components there were. I passed every performance tests thanks to a divide and conquer approach (I divided the plane in a grid)
In a team of 3, which I led, we had to design a graphical interface library which allowed users to create and interact with windows and buttons. We had to implement high level concepts such as classes and polymorphism in C. And also low level practices with events and interruptions
In a team of 3, using a simulation library, we had to implement rules and simulate agents using those rules. A simple example we had to do was to simulate Conway's Game of life