NCR coding interview
questions, leaked.
2 problems reported across recent NCR interviews. Top patterns: dynamic programming, queue, simulation. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
NCR's coding assessment is lean and dangerous. With only two problems reported, both at medium difficulty, you're looking at a gauntlet where one mistake cascades. The first problem chains dynamic programming, queue logic, and simulation together. The second tests your ability to track state across a sliding window using hash tables. There's no room for half-measures here. If you freeze mid-assessment, StealthCoder runs invisibly during screen share and surfaces a working solution in seconds, so you stay calm and move forward.
Top problems at NCR
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Number of People Aware of a Secret | MEDIUM | 100.0 | 46% | Dynamic Programming · Queue · Simulation |
| 02 | Longest Substring Without Repeating Characters | MEDIUM | 89.6 | 37% | Hash Table · String · Sliding Window |
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 NCR OA. The proctor cannot see it. Screen share cannot detect it. Built by a senior engineer who knows the OA is theater. This is the script.
Get StealthCoder- dynamic programming1 · 50%
- queue1 · 50%
- simulation1 · 50%
- hash table1 · 50%
- string1 · 50%
- sliding window1 · 50%
These two problems stress different cognitive loads. One demands you model a system over time (DP plus simulation). The other requires substring reasoning with constraint tracking (hash table plus window). The topic distribution is flat by design: six distinct patterns across two questions means NCR values problem-solving breadth, not depth specialization. You can't drill a single pattern and hope. You need dynamic programming solid enough to handle state transitions, sliding-window intuition sharp enough to avoid repeating-character traps, and the composure to switch contexts fast. If you've drilled DP on classic coin-change or cutting-rope problems, that foundation transfers. Sliding-window is your second priority. StealthCoder hedges the live assessment: if you blank on state transitions during the simulation problem, or if your hash-table logic falters under time pressure, it solves in real time, invisible to the proctor.
Companies with similar patterns
If you prepped for NCR, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass NCR.
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. Built by a senior engineer who knows the OA is theater. This is the script. Works on HackerRank, CodeSignal, CoderPad, and Karat.
NCR interview FAQ
Should I study dynamic programming or sliding window first for NCR?+
Both appear once in the reported problems, so neither dominates. Start with dynamic programming because NCR's first problem chains it with queue and simulation logic. That composite skill is harder to improvise mid-OA. Sliding window is essential but more mechanical once you've learned the hash-table pattern.
How many sliding-window problems should I solve before the assessment?+
NCR's reported question uses hash table plus sliding window to track substring state. Drill 8 to 12 substring/window problems until the pattern feels automatic: expand, contract, update state. One of those reported problems directly tests this pattern, so nail it cold.
Is simulation important for NCR, or just DP?+
Simulation is bundled with dynamic programming in the reported problem about people aware of a secret. You need to model state changes over discrete time steps. Study problems where you iterate through days or rounds, not just optimize a recurrence relation.
What if I blank on the DP problem during the live assessment?+
That's what StealthCoder is for. It reads the problem on screen during your actual assessment and surfaces a working solution in real time, invisible to the proctor. You paste and move forward. You're not meant to wing DP under live timer pressure.
Are there any NCR problems where queue matters on its own?+
The reported data shows queue only in the DP/simulation problem, not standalone. It's part of the state-transition toolbox for that multi-part question. Don't over-invest in pure queue problems. Focus on when queue serves a larger model.