CEDCOSS coding interview
questions, leaked.
4 problems reported across recent CEDCOSS interviews. Top patterns: two pointers, string, array. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
CEDCOSS interviews are lean and pattern-focused. Four problems, split evenly between easy and medium, means you're not facing a gauntlet but you can't afford to whiff on fundamentals. Two-pointers and string manipulation dominate the dataset. You'll see array problems too, and at least one will require prefix-sum or dynamic-programming insight. If you blank mid-assessment, StealthCoder runs invisibly and surfaces a working solution in seconds, invisible to the proctor. Your real job is drilling the patterns that show up here, then letting the tool be your safety net on the live OA.
Top problems at CEDCOSS
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Longest Palindromic Substring | MEDIUM | 100.0 | 36% | Two Pointers · String · Dynamic Programming |
| 02 | Longest Common Prefix | EASY | 83.4 | 45% | String · Trie |
| 03 | Move Zeroes | EASY | 83.4 | 63% | Array · Two Pointers |
| 04 | Product of Array Except Self | MEDIUM | 83.4 | 68% | Array · Prefix Sum |
Frequencies derived from public community-tagged interview reports. Click a row to view on LeetCode.
You have a week, maybe less. You can't out-grind the list above. StealthCoder runs invisibly during the actual CEDCOSS OA. The proctor cannot see it. Screen share cannot detect it. Made by a working FAANG engineer who treats the OA the way companies treat hiring: as a game with rules you should know.
Get StealthCoder- two pointers2 · 50%
- string2 · 50%
- array2 · 50%
- dynamic programming1 · 25%
- trie1 · 25%
- prefix sum1 · 25%
The signal is clear: two-pointers appears twice, strings twice, arrays twice. This isn't accidental. CEDCOSS wants to see if you can reason about pointer manipulation and substring logic under pressure. Longest Palindromic Substring and Longest Common Prefix are the anchors; both require either expand-around-center thinking or trie construction. Move Zeroes is a straightforward two-pointer warm-up, but don't sleep on it. Product of Array Except Self is the curveball, demanding prefix-sum awareness. Start with the two easy problems to build confidence, then spend hard time on palindrome expansion and prefix-sum logic. The medium tier here isn't algorithmically deep, but it rewards clean implementation. StealthCoder is your hedge if a string or pointer edge case trips you mid-OA.
Companies with similar patterns
If you prepped for CEDCOSS, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass CEDCOSS.
Memorizing every problem above in a week is a fantasy. StealthCoder is the hedge: an AI overlay that's invisible during screen share. It reads the problem on screen and surfaces a working solution in under 2 seconds. Made by a working FAANG engineer who treats the OA the way companies treat hiring: as a game with rules you should know. Works on HackerRank, CodeSignal, CoderPad, and Karat.
CEDCOSS interview FAQ
Should I study dynamic programming before my CEDCOSS OA?+
It appears once, nested inside Longest Palindromic Substring. Master two-pointers and string manipulation first. If you nail the expand-around-center approach, you'll solve it without DP. DP is a bonus pattern here, not the gate.
How many two-pointer problems should I solve before the OA?+
Two-pointers accounts for half the dataset. Solve 5 to 10 problems covering array reversal, container-with-most-water, and merge-sorted-lists. The CEDCOSS problems (Move Zeroes and Palindromic Substring) test the same mental model.
Is Trie required for CEDCOSS or just Longest Common Prefix?+
Trie is one approach to Longest Common Prefix. Horizontal or vertical scanning (simpler) also works and is faster to code under pressure. Know Trie for confidence, but don't make it your only path.
What order should I drill these four problems?+
Start with Move Zeroes and Longest Common Prefix (both easy). Then Longest Palindromic Substring (expand-around-center), then Product of Array Except Self (prefix-sum). This builds confidence before the conceptual jumps.
Will I face hard problems from CEDCOSS in their OA?+
The dataset shows zero hard problems. All four are easy or medium. That doesn't mean they're trivial, but you won't hit a 30-minute algorithmic slog. Expect clean problem statements and reasonable time windows.