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![VERTICAL ORDER TRAVERSAL OF A BINARY TREE [HARD] | LEETCODE # 987 | PYTHON SOLUTION](/_next/image?url=https%3A%2F%2Fi.ytimg.com%2Fvi%2F_8yW-dQVJHM%2Fhq720.jpg%3Fsqp%3D-oaymwEXCNAFEJQDSFryq4qpAwkIARUAAIhCGAE%3D%26rs%3DAOn4CLDQom_WD3EW4nzA6c6Dg9a_L3Bqmg&w=256&q=75)
