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Online Round
Most liked problem by participants...
Problem 4: Simp 1

Amy has a crush on Jake. She has been chasing him for the past 5 years, unsuccessfully. Frustrated by her persistence, Jake gets the help of a highly intelligent dog to catch her in a game of tag on the 2D plane. If Amy catches Jake (reaches the same location in the plane) before Jake's dog catches her, she wins. Else, Jake and his dog win.

What is the minimum top speed that Amy needs so that she can always win, given various top speeds of Jake and his dog?

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Grand Finals
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Grand Finals Recap

Grand Finals welcomes Junior teams

Junior teams made their finals debut, alongside our first experimental problems. Find out more about the event, the winners, and the problems in this recap!

Read the recap
SPhL 2026 Organising Team
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Deputy Chief Organiser
Lead Developer
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Lead Developer
Aaron Ng
Problem Setter
E-jie Tan
Problem Setter
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Liu Zhi
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Raphael Teng
Problem Setter
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Teo Kai Wen
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Xu Kangyou
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Caleb Chia
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