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amberriver
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Ruoshui Song
amberriver
Specialist
United Kingdom
United Kingdom
Joined Apr 9, 2026
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amberriver has completed the contest Blitz Round #18 and scored 450 points2 months ago
amberriver solved problem Nasser's Prime Slices (#12432) on 4 attempt2 months ago
amberriver solved problem Rufo's massive (#12430) on first attempt2 months ago
amberriver solved problem Area (#12429) on first attempt2 months ago
amberriver has joined contest Blitz Round #182 months ago
amberriver solved problem Competitors’ quantity of the Olympiad (#43) on first attempt2 months ago
amberriver solved problem Degree of symmetry (#19) on first attempt2 months ago
amberriver solved problem The Ticket Chase (#14) on first attempt2 months ago
amberriver has completed the contest Weekend Practice #22 and scored 520 points2 months ago
amberriver solved problem Exam for the Night's Watch (#12424) on 2 attempt2 months ago
amberriver solved problem Coding Errors (#12423) on first attempt2 months ago
amberriver solved problem Bread Sorting (#6828) on first attempt2 months ago
amberriver has joined contest Weekend Practice #21 2 months ago
amberriver has joined contest Weekend Practice #222 months ago
amberriver solved problem Sequence (#1083) on first attempt2 months ago
amberriver solved problem Sum of squares Cnk (#11271) on first attempt2 months ago
amberriver solved problem Perfect square (#8877) on first attempt2 months ago
amberriver solved problem Sum and amount (#8684) on first attempt2 months ago
amberriver has joined contest Educational Round #102 months ago
amberriver has joined contest Weekend Practice #202 months ago
amberriver has joined contest Training team contest for schoolchildren2 months ago
amberriver solved problem Digits (#2) on first attempt2 months ago
amberriver solved problem Simple problem (#1) on first attempt2 months ago