IOI 2019 Archives | Australian Maths Trust

Departure

The wait at the airport saw the team attempting to maximise the volume of water collected from the faulty tap near gate 10. We also enjoyed Kevin’s amazing commentary on touchscreen air hockey played by two toddlers. It was a true shame that I forgot to take a video of that despite being the keeper of the GoPro.

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Timmy’s birthday

Today is my last full day with the IOI team, and what a week it has been. Following a five hour exam where I saw my first splash of the elusive CMS green colour (indicating that we had gotten a full score of 100 on a problem), we went to a nice Cuban cafe where we were joined by Ray Li, who came to pass along some words of wisdom regarding how to handle big exams.

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Black or Cyan?

Tonight’s game was based off of the first question of today’s exam — given a rectangular grid of squares coloured either black or cyan, find an arrangement using the least number of non-overlapping rectangles which covers all cyan squares and doesn’t cover any black squares.

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Wet, Wet, Wet

CEOI day 2 was the trial exam for today. The problems were interesting and more difficult than those in the previous trial exams. After the trial exam we, had our customary frisbee session. This time, we had a person in the middle of the cycle / circle trying to fail the others and replace them.

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