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NueraMock — Interview Session
LIVE
18:42
A

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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