Binary Tree, Data Structure Algorithm, Algorithms, Dotnet, Csharp.
ReverseLevelOrder(root, 0, levels); // Create a new list to store the reversed levels IList<IList<int>> reversedLevels = new List<IList<int>>(); // Reverse the order of the levels to achieve bottom-up traversal for (int i = levels.Count - 1; i >= 0; i--) { reversedLevels.Add(levels[i]); } // Return