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yevhen_ostash
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yevhen
yevhen_ostash
Ukraine
Ukraine
Joined Nov 5, 2025
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yevhen_ostash solved problem Sequence (#1083) on first attempt1 month ago
yevhen_ostash solved problem Sum of squares Cnk (#11271) on 2 attempt1 month ago
yevhen_ostash solved problem Perfect square (#8877) on first attempt1 month ago
yevhen_ostash solved problem Sum and amount (#8684) on first attempt1 month ago
yevhen_ostash has joined contest Educational Round #101 month ago
yevhen_ostash has joined contest Educational Round #92 months ago