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Latest problems
Lucky Number Scores #491
Circuit Board Connections #490
TV Charity Fundraiser #489
Accurate Curve Fitting #488
Reduce and Equalise #487
Two Colour Special Nim #486
Magic 3 #485

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Top Brethren and Sistren of the Week

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User	Rank	Solved

Recent at Forums:

Problem 30 is currently impossible in brainfuck

from KingSweat, last KingSweat

last at Apr 14 2026 11:01

Lucky Number Scores - A Proposed New Problem

from CSFPython, last Rodion (admin)

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The input data for Problem 368 contains an error

from kajuyone, last kajuyone

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Google login issue again

from Rodion (admin), last Rodion_Gork

last at Apr 6 2026 11:04

Bug with validation of solutions for 207 Suffix array

from damian_zb, last Rodion (admin)

last at Mar 31 2026 23:17