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You are given a rooted tree with root in vertex 1. Each vertex is coloured in some colour.Let's call colour c dominating in the subtree of vertex v if there are no other colours that appear in the

Peterson loves to learn new languages, but his favorite hobby is making new ones. Language is a set of words, and word is a sequence of lowercase Latin letters.Peterson makes new language every mo

Though being cruel and merciless in the battlefields, the total obedience to the command hierarchy makes message delivering between Stormtroopers quite inefficient, which finally caused the escape of