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Linked List Basics

Alex Chen25 min readUpdated

Linked list questions at Palo Alto Networks are short, and one of them is asked far more than the rest. It came up after a Codility test in Israel, again in a senior data engineer's second round, and in a principal candidate's San Jose round that then moved on to OS locking.

The other two come from campus and early-career loops. Those rounds mix C and C++ basics in with the coding, so expect a pointer question once your answer works, about a null pointer or why a dummy head helps. Have a short answer ready. Each of the three takes a single pass and O(1) extra space. Start with the one asked most, then work through the other two.

Palo Alto NetworksPremium lesson · Coding round

The 3 Palo Alto Networks problems are below.

  1. A Premium questionCoding · Easy · Frequently asked
  2. A Premium questionCoding · Easy
  3. A Premium questionCoding · Easy

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