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KostyaInvisible
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Костянтин Віталійович Петухов
KostyaInvisible
Ukraine
Ukraine
Joined Nov 5, 2025
Achievements (52)
Hello WorldEasy Start
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KostyaInvisible solved problem Testing System (#4416) on first attempt4 months ago
KostyaInvisible solved problem Sequence (#1083) on first attempt4 months ago
KostyaInvisible solved problem Sum of squares Cnk (#11271) on first attempt4 months ago
KostyaInvisible solved problem Perfect square (#8877) on first attempt4 months ago
KostyaInvisible solved problem Sum and amount (#8684) on first attempt4 months ago
KostyaInvisible has joined contest Educational Round #104 months ago