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NueraMock — Interview Session

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18:42

Alex · AI Interviewer

Good approach with the sliding window. What's the time complexity?

ProblemMedium

Longest Substring Without Repeating Characters

Given a string s, find the length of the longest substring that contains no repeating characters.

Input: "abcabcbb"
Output: 3
// "abc" has length 3

Input: "bbbbb"
Output: 1

Scratchpad— think out loud

# approach: sliding window + hash set

- left ptr = 0, right ptr scans forward

- if char in set → shrink from left

- track max window size

# complexity:

- time: O(n) — each char added/removed once

- space: O(min(n, m)) — charset size

edge cases: empty string, all unique, all same

solution.jsJavaScript

✓ 3 / 3 tests passed

/**

* @param {string} s

* @return {number}

var lengthOfLongestSubstring = function(s) {

const seen = new Set();

let left = 0, max = 0;

for (let r = 0; r < s.length; r++) {

while (seen.has(s[r])) {

seen.delete(s[left++]);

}

seen.add(s[r]);

max = Math.max(max, r - left + 1);

}

return max;

};

✓Input:"abcabcbb"→ Expected3got3

✓Input:"bbbbb"→ Expected1got1

✓Input:"pwwkew"→ Expected3got3

Runtime: 68ms · Memory: 43.8 MB

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Session Debrief— Longest Substring Without Repeating Characters · Google SWE

Score84 / 100

Dimensional Scores

Problem Solving88/100

Code Quality91/100

Communication74/100

Time Complexity82/100

AI Feedback

Optimal sliding-window approach with correct O(n) time and O(k) space — well executed.

Clear variable naming and consistent indentation throughout the solution.

Verbalize your thought process earlier — explain the brute-force trade-off before jumping to the optimized solution.

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