- Find a node which is at max distance from node ( burnt tree)- https://stackoverflow.com/questions/52787803/given-a-node-how-long-will-it-take-to-burn-the-whole-binary-tree
- OOPS Design swiggy- https://www.c-sharpcorner.com/UploadFile/8911c4/singleton-design-pattern-in-C-Sharp/
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