## Round 1 - Coding **Format:** 45-minute phone screen with a shared code editor. Two problems, difficulty easy to medium. **Q1:** Given a string, find the length of the longest substring without repeating characters. ```python def length_of_longest_substring(s: str) -> int: pass ``` **Example:** ``` Input: "abcabcbb" Output: 3 ("abc") Input: "bbbbb" Output: 1 ("b") ``` **Q2:** Given a binary tree, return the level-order traversal as a list of lists. ```python def level_order(root: TreeNode) -> list[list[int]]: pass ``` **Example:** ``` Input: root = [3,9,20,null,null,15,7] Output: [[3],[9,20],[15,7]] ``` ## Follow-ups 1. For Q1: what is the time complexity of your sliding window approach? Can you reduce space usage? 2. For Q1: how would you handle Unicode characters vs. ASCII-only? 3. For Q2: how would you do a right-side view (only rightmost node per level)? 4. For Q2: how would you do a zigzag (left-to-right, then right-to-left alternating) traversal?

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Yahoo Phone Interview: Coding Problems and Format

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Round 1 - Coding Format: 45-minute phone screen with a shared code editor. Two problems, difficulty easy to medium. Q1: Given a string, find the length of the longest substring without repeating characters. Example: Q2: Given a binary tree, return the level-order traversal as a list of lists. Example: Follow-ups For Q1: what is the time complexity of your sliding window approach? Can you reduce space usage? For Q1: how would you handle Unicode characters vs. ASCII-only? For Q2: how would you do…

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This is a reported interview question from a yahoo interview during the phone round.

It covers the following topics: Strings, Sliding Window, Binary Tree, Phone, Coding .

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Strings Sliding Window Binary Tree Phone Coding

Yahoo Phone Interview: Coding Problems and Format

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