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![[Eng] Biweekly Contest 99 | 2581. Count Number of Possible Root Nodes](/_next/image?url=https%3A%2F%2Fi.ytimg.com%2Fvi%2FuKu9sIbMNCQ%2Fhq720.jpg%3Fsqp%3D-oaymwEXCNAFEJQDSFryq4qpAwkIARUAAIhCGAE%3D%26rs%3DAOn4CLC1tOhqy1zJCe2pRzRUnUxLPRatig&w=256&q=75)
