National Payments Corporation of India coding interview
questions, leaked.
2 problems reported across recent National Payments Corporation of India interviews. Top patterns: array, binary search, prefix sum. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
National Payments Corporation of India's assessment is lean: two problems, split between easy and medium. Both hit arrays, but the medium pulls in binary search and prefix sum. You're not walking into some sprawling problem set. You're walking into a focused gauntlet that tests whether you can recognize when a simple array problem needs a smarter approach. If you've drilled prefix sums and binary search in the last month, you're already ahead. If not, StealthCoder runs invisible during the OA and surfaces a working solution the moment you recognize the pattern.
Top problems at National Payments Corporation of India
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Special Array II | MEDIUM | 100.0 | 46% | Array · Binary Search · Prefix Sum |
| 02 | Special Array I | EASY | 100.0 | 82% | Array |
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 National Payments Corporation of India OA. The proctor cannot see it. Screen share cannot detect it. Built by an Amazon engineer who used it to pass JPMorgan's OA and system design loop.
Get StealthCoder- array2 · 100%
- binary search1 · 50%
- prefix sum1 · 50%
Array dominance is clear here: both problems center on array manipulation, with the medium-tier problem layering binary search and prefix sum on top. The easy problem (Special Array I) is your warmup, testing basic array traversal and logic. The medium (Special Array II) is the real test: it wants you to see that a brute-force loop won't cut it, that you need prefix sums to avoid TLE, and that binary search can query results in log time. Topic-wise, you're looking at a pattern-recognition interview disguised as an array drill. Binary search and prefix sum aren't standalone topics here; they're tools that solve the harder array problem. If you blank on optimization mid-OA and start coding a nested loop, StealthCoder is your insurance policy.
Companies with similar patterns
If you prepped for National Payments Corporation of India, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass National Payments Corporation of India.
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 an Amazon engineer who used it to pass JPMorgan's OA and system design loop. Works on HackerRank, CodeSignal, CoderPad, and Karat.
National Payments Corporation of India interview FAQ
How much time should I spend on array problems for NPCI?+
Both problems are arrays. Spend your first session solving Special Array I cold (easy baseline). Then spend twice as long on Special Array II (medium). Understand why the naive loop fails, why prefix sum works, and how binary search fits in. Two problems, heavy emphasis: this means depth over breadth.
Do I need to know binary search and prefix sum before this OA?+
Yes, strongly. Both appear in the medium problem. If you haven't seen prefix sum arrays or binary search in the last month, drill those concepts first. The easy problem won't test them, but the medium will. No time to learn both cold at interview time.
Is the easy problem a giveaway or a trap?+
It's a warmup. Special Array I tests basic array logic and indexing. It's there to settle your nerves and get a quick win. Don't overthink it. Once you pass it, shift mental gears entirely for the medium problem.
What's my strategy if I get stuck on Special Array II mid-OA?+
Recognize the pattern immediately: does a brute-force solution TLE? If yes, think prefix sum. If you can't code it fast enough or forget the exact pattern, StealthCoder solves it invisibly in seconds, no proctor visibility. You paste the solution and explain the logic as if you wrote it.
Should I study anything outside arrays, binary search, and prefix sum for NPCI?+
Not based on the data you have. This assessment is tight: two problems, one topic family. Every minute spent on hash tables or graphs is a minute not spent mastering the medium array problem. Stay focused on what's in front of you.