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![Smallest String Starting From Leaf [Watch at 1.25x] | DFS | Binary Tree | LeetCode Daily Challenge](/_next/image?url=https%3A%2F%2Fi.ytimg.com%2Fvi%2F5jJ9KkSXGXU%2Fhq720.jpg%3Fsqp%3D-oaymwEXCNAFEJQDSFryq4qpAwkIARUAAIhCGAE%3D%26rs%3DAOn4CLAuGszzC6WuqktriuPXmUIOxOZZBw&w=256&q=75)
