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![Dynamic programming + Math: Count sorted vowel strings (LeetCode #1641) [3 solutions]](/_next/image?url=https%3A%2F%2Fi.ytimg.com%2Fvi%2F_SgsB1ZhcIQ%2Fhq720.jpg%3Fsqp%3D-oaymwEXCNAFEJQDSFryq4qpAwkIARUAAIhCGAE%3D%26rs%3DAOn4CLBM5v8D7WbH6IdauoG4sOTUuj0qjQ&w=256&q=75)
