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chyckchyryk
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Roman Derkach
chyckchyryk
Candidate
Ukraine
Ukraine
Joined Aug 8, 2025
Achievements (2)
Problem Solver 2Problem Solver
OverviewRatingAchievementsPosts
Rating
1768
Problems217
Submissions295
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Rating evolution

chyckchyryk has joined contest UOI 2026. Day 22 days ago
chyckchyryk has completed the contest Blitz Round #19 and scored no score8 days ago
chyckchyryk has joined contest Blitz Round #198 days ago
chyckchyryk has completed the contest Blitz Round #18 and scored 700 points22 days ago
chyckchyryk solved problem Nasser's OR Removal (#12433) on first attempt22 days ago
chyckchyryk solved problem Rufo's massive (#12430) on 5 attempt22 days ago
chyckchyryk solved problem Nasser's Prime Slices (#12432) on 5 attempt22 days ago
chyckchyryk has joined contest Blitz Round #1822 days ago
chyckchyryk has completed the contest Weekend Practice #22 and scored no score29 days ago
chyckchyryk has joined contest Weekend Practice #2229 days ago
chyckchyryk solved problem Sum of squares Cnk (#11271) on first attempt1 month ago
chyckchyryk solved problem City Horizon (#7747) on first attempt1 month ago
chyckchyryk solved problem Square (#7757) on first attempt1 month ago
chyckchyryk solved problem Testing System (#4416) on first attempt1 month ago
chyckchyryk solved problem Sequence (#1083) on 7 attempt1 month ago
chyckchyryk solved problem Perfect square (#8877) on first attempt1 month ago
chyckchyryk solved problem Sum and amount (#8684) on first attempt1 month ago
chyckchyryk has joined contest Educational Round #101 month ago
chyckchyryk has completed the contest Blitz Round #17 and scored 575 points1 month ago
chyckchyryk solved problem Majestic Numbers (#12419) on 3 attempt1 month ago
chyckchyryk solved problem ILOVEPRODUCT (#12422) on 3 attempt1 month ago
chyckchyryk solved problem 67 in 2026? (#12418) on first attempt1 month ago
chyckchyryk has joined contest Blitz Round #171 month ago
chyckchyryk has completed the contest Weekend Practice #21 and scored 100 points1 month ago
chyckchyryk solved problem Team Building 2 (#12411) on first attempt1 month ago