This problem from the 2023 IMO is super cool. It’s a fantastic example of what an IMO problem should be - something that a clever high school student can understand (with no knowledge of university mathematics), but that still challenges the best of the best.
What’s more, it has a nice solution that may surprise you (well it surprised me anyway! 😁).
Written article here:
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Негізгі бет NICEST IMO Problem Ever? Ninja Says Yes! (IMO 2023 P5)
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