MSCI coding interview
questions, leaked.
1 problems reported across recent MSCI interviews. Top patterns: array, hash table, string. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
MSCI's interview is lean but mean. With only one reported problem in the dataset, you're looking at a narrow aperture into what they actually ask. That problem, Group Anagrams, sits at medium difficulty and spans four core patterns: arrays, hash tables, strings, and sorting. The signal is clear: they test pattern recognition across data structures, not just isolated algorithmic speed. If you blank on the hash-table or sorting piece mid-assessment, StealthCoder runs invisibly and surfaces a working solution in seconds.
Top problems at MSCI
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Group Anagrams | MEDIUM | 100.0 | 71% | Array · Hash Table · String |
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 MSCI OA. The proctor cannot see it. Screen share cannot detect it. Built because the OA filter rejects engineers who'd pass the on-site. That's a broken filter. This is the workaround.
Get StealthCoder- array1 · 100%
- hash table1 · 100%
- string1 · 100%
- sorting1 · 100%
Group Anagrams is a Swiss Army knife problem. It forces you to juggle string manipulation, sorting logic, and hash-table organization all at once. The medium rating suggests it's not a gimmick question: you need clean code and the right data-structure choice. Since the problem touches array, hash-table, string, and sorting simultaneously, MSCI is likely filtering for candidates who can hold multiple concepts in their head and map between them. That's different from grinding 200 problems. You need depth on these four patterns and the ability to combine them. If you hit a wall on the sorting angle or forget how to group by a canonical key, StealthCoder hedges the risk on the live OA.
Companies with similar patterns
If you prepped for MSCI, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass MSCI.
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 because the OA filter rejects engineers who'd pass the on-site. That's a broken filter. This is the workaround. Works on HackerRank, CodeSignal, CoderPad, and Karat.
MSCI interview FAQ
What should I focus on if I only have a week before the MSCI assessment?+
Master Group Anagrams cold. Build the hash-table grouping logic, practice sorting strings, and understand why canonical form (sorted characters) works as a key. Then drill similar multi-pattern problems: word ladder, longest substring, valid anagram. MSCI seems to prize pattern layering, not breadth.
Is one medium problem enough to prepare for MSCI?+
It's a narrow signal, but that's your advantage. The reported problem covers four topics at once, so it's deeper than it looks. Solve Group Anagrams ten different ways. Understand every edge case. One deep problem beats a thousand shallow drills for companies that ask consolidated patterns.
Should I practice easy problems before attempting the MSCI medium?+
Not critical here. The dataset shows zero easy problems reported, and the one medium is the actual target. Spend time on the four patterns (array, hash-table, string, sorting) in isolation first, then combine them in Group Anagrams. Skip the warm-up grind.
What makes Group Anagrams hard enough for a medium rating at MSCI?+
It's not the sorting or hashing alone. The difficulty sits in the mapping step: choosing a canonical representation (sorted characters) as your grouping key, then organizing results. Many candidates overthink it or pick inefficient key schemes. That's where the medium bar lives.
Will sorting and hash-table questions dominate my MSCI interview?+
Based on the data, they're equally weighted in the one problem we see. Hash-table for grouping, sorting for canonicalization. Don't assume one is more important. Both are baked into the same problem, so treat them as a unit, not separate topics.