singularity

📄 LC-110-balanced-binary-tree
📄 LC-1382-balance-a-binary-tree
📄 LC-199-binary-tree-right-side-view
📄 LC-2096-step-by-step-directions-from-a-binary-tree-node-to-another
📄 LC-2196-create-binary-tree-from-descriptions
📄 LC-543-diameter-binary-tree
📄 LC-703-kth-largest-element-in-a-stream
📄 LC-94-binary-tree-inorder-traversal