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![my attempt at solving leetcode 2544: alternating digit sum [SOLVED]](/_next/image?url=https%3A%2F%2Fi.ytimg.com%2Fvi%2FWwq-vFoHRSo%2Fhq720.jpg%3Fsqp%3D-oaymwEXCNAFEJQDSFryq4qpAwkIARUAAIhCGAE%3D%26rs%3DAOn4CLBpMgK5SzzXd3eLUaNQhjHs7Ws0MQ&w=256&q=75)