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Update knowledge.txt

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- Technical — Tech
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  Question: Write a function to detect a cycle in a linked list.
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  Possible Answers: 1. Use Floyd’s Tortoise and Hare algorithm to detect the cycle. 2. Track visited nodes using a hash set and check for repeats. 3. Traverse the list and check if a node points back to a previous one.
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  Question: How would you design a URL shortening service like Bit.ly?
 
 
1
  Question: Write a function to detect a cycle in a linked list.
2
  Possible Answers: 1. Use Floyd’s Tortoise and Hare algorithm to detect the cycle. 2. Track visited nodes using a hash set and check for repeats. 3. Traverse the list and check if a node points back to a previous one.
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  Question: How would you design a URL shortening service like Bit.ly?