Problem database last updated: June 20, 2025
4 problems · 2 Easy, 2 Medium, 0 Hard · Ranked #271 of 458
2 Easy
50% · avg 23%
2 Medium
50% · avg 59%
0 Hard
0% · avg 18%
Based on 4 reported problems, CEDCOSS interviews are easier than average - only 0% Hard compared to 18% across all companies.
Compared to the industry average, CEDCOSS puts unusual emphasis on two-pointers (50% of problems, 3.7x the industry average), string (50% of problems, 1.8x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are array (75%), two-pointers (50%), string (50%), dynamic-programming (25%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Longest Palindromic Substring Given a string s, return the longest palindromic substring in s. | Medium | Very Likely | two-pointersstringdynamic-programming | Solve |
Longest Common Prefix Write a function to find the longest common prefix string amongst an array of strings. | Easy | Very Likely | arraystringtrie | Solve |
Product of Array Except Self Given an integer array nums, return an array answer such that answer[i] is equal to the product of all the elements of nums except nums[i]. | Medium | Very Likely | arrayprefix-sum | Solve |
Move Zeroes Given an integer array nums, move all 0's to the end of it while maintaining the relative order of the non-zero elements. | Easy | Very Likely | arraytwo-pointers | Solve |
Longest Palindromic Substring
SolveGiven a string s, return the longest palindromic substring in s.
Longest Common Prefix
SolveWrite a function to find the longest common prefix string amongst an array of strings.
Product of Array Except Self
SolveGiven an integer array nums, return an array answer such that answer[i] is equal to the product of all the elements of nums except nums[i].
Move Zeroes
SolveGiven an integer array nums, move all 0's to the end of it while maintaining the relative order of the non-zero elements.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent CEDCOSS interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
CEDCOSS interviews focus heavily on array, two-pointers, string problems. If you're short on time, these are the categories to prioritize. The problems on this page are sorted by frequency, so start from the top and work your way down.
Beyond solving problems, practice explaining your approach. CEDCOSS interviewers care about your thought process - how you break down a problem, consider edge cases, and evaluate tradeoffs between solutions. A clean O(n) solution you can explain clearly beats an O(log n) solution you can't articulate.
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CEDCOSS has been reported to ask 4 distinct coding problems. The most common topics are array, two-pointers, string. 2 are Easy difficulty, 2 are Medium, and 0 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 4 reported problems, CEDCOSS interviews are easier than average - only 0% Hard compared to 18% across all companies. 50% of questions are Medium difficulty. Focus on the high-frequency Medium problems first, then work through the Hard ones.
Start with the highest-frequency problems listed on this page. Focus on the core topics: array, two-pointers, string. Practice solving them under time pressure and explaining your approach out loud. Mock interviews with AI can simulate the real experience.
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