The structure itself wasn't hard to parse but I second-guessed the path-building part for longer than I should have.
Start by clarifying the node structure and path format, then outline a recursive DFS that builds paths from root to leaves. Emphasize that you only add a path when the node is a file, and discuss complexity and edge cases.
Pro tip: Mention that you can avoid string concatenation overhead by passing a mutable path list and joining only at file nodes, which shows performance awareness for large file systems.
Confirm the node structure (name, isFile, children) and the expected path format (e.g., '/dir/file.txt'). Ask about edge cases like empty tree or root being a file.
Use recursive DFS. Maintain a current path as a list of names; at each node, append the node's name, and if it's a file, join the path into a string and add to results.
Write a helper function that takes the node and current path. Iterate over children, recurse, and backtrack by removing the last path component after processing.
State time complexity O(N) where N is number of nodes, and space O(H) for recursion stack plus output. Discuss handling of empty tree, root as file, and deep recursion.
Walk through a small example tree to verify paths are correct and no duplicates. Mention potential follow-ups like iterative DFS or handling symlinks.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.