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![LEETCODE : Flatten a Multilevel Doubly Linked List [ USING STACKS ]](/_next/image?url=https%3A%2F%2Fi.ytimg.com%2Fvi%2FHLktFO0sv0c%2Fhq720.jpg%3Fsqp%3D-oaymwEXCNAFEJQDSFryq4qpAwkIARUAAIhCGAE%3D%26rs%3DAOn4CLAijBnr2r8cbucEuyyV_PJ5KLIt5g&w=256&q=75)
