Sum of prime numbers Andrey Tsvetkov

Compute the sum of all prime numbers in a stream of binary integers as fast as possible.

Input: 1 000 000 uint32 values in little-endian binary on STDIN (4 bytes each).

Output: The uint64 sum of all values that are prime, printed as a decimal string.

Discussion (3)
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Haha Expert
Haha ExpertSep 2, 2026 11:50

Victor Mercklé

Victor Mercklé→Sum of prime numbersCPP
8 minutes ago

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Victor Mercklé

Victor Mercklé→Format integersCPP
11 minutes ago

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Victor Mercklé

Victor Mercklé→Sum of prime numbersCPP
20 minutes ago

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Victor Mercklé

Victor Mercklé→Fizz BuzzCPP
20 minutes ago

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Victor Mercklé

Victor Mercklé→Parse integersCPP
26 minutes ago

Error

Victor Mercklé

Victor Mercklé→Format integersCPP
26 minutes ago

Success

 

 

 

Victor Mercklé

Victor Mercklé→Parse integersCPP
27 minutes ago

Error

In 19 minutes, 7 solutions to 5 problems were proposed.

Haha Expert
Haha ExpertSep 2, 2026 11:40

Victor Mercklé PhD Student in Machine Learning - and my previous remarks are already starting to make sense…

Haha Expert
Haha ExpertSep 2, 2026 11:35

Maybe I don’t understand something about programming, but the leader in the overall rating spends 1 minute solving DIFFERENT tasks, which looks more like an automated process involving several AI agents.