Siemens coding interview
questions, leaked.
25 problems reported across recent Siemens interviews. Top patterns: array, sorting, hash table. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
Siemens asks 25 coding problems across their assessment, split 10 easy, 11 medium, 4 hard. Arrays dominate the list at 14 problems, followed by sorting and hash tables at 7 each. You'll see string and linked-list work too. Most candidates prep by grinding the obvious patterns, then blank on medium-to-hard hybrids during the live OA. That's where StealthCoder runs invisible during screen share, reads the problem, and surfaces a working solution in seconds while the proctor sees nothing. It's your safety net for whatever you didn't have time to drill before the assessment.
Top problems at Siemens
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Peaks in Array | HARD | 100.0 | 26% | Array · Binary Indexed Tree · Segment Tree |
| 02 | Minimized Maximum of Products Distributed to Any Store | MEDIUM | 100.0 | 63% | Array · Binary Search · Greedy |
| 03 | Number of Islands | MEDIUM | 94.5 | 62% | Array · Depth-First Search · Breadth-First Search |
| 04 | Valid Parentheses | EASY | 82.9 | 42% | String · Stack |
| 05 | Merge Intervals | MEDIUM | 82.9 | 49% | Array · Sorting |
| 06 | The Skyline Problem | HARD | 70.3 | 44% | Array · Divide and Conquer · Binary Indexed Tree |
| 07 | Reverse Linked List | EASY | 70.3 | 79% | Linked List · Recursion |
| 08 | Letter Combinations of a Phone Number | MEDIUM | 70.3 | 64% | Hash Table · String · Backtracking |
| 09 | Best Time to Buy and Sell Stock | EASY | 70.3 | 55% | Array · Dynamic Programming |
| 10 | LFU Cache | HARD | 70.3 | 47% | Hash Table · Linked List · Design |
| 11 | Contains Duplicate | EASY | 70.3 | 63% | Array · Hash Table · Sorting |
| 12 | Merge Two Sorted Lists | EASY | 70.3 | 67% | Linked List · Recursion |
| 13 | Minimum Add to Make Parentheses Valid | MEDIUM | 60.4 | 75% | String · Stack · Greedy |
| 14 | Rotate List | MEDIUM | 60.4 | 40% | Linked List · Two Pointers |
| 15 | Remove Duplicates from Sorted Array | EASY | 60.4 | 60% | Array · Two Pointers |
| 16 | Seat Reservation Manager | MEDIUM | 60.4 | 66% | Design · Heap (Priority Queue) |
| 17 | Palindrome Linked List | EASY | 60.4 | 56% | Linked List · Two Pointers · Stack |
| 18 | Valid Anagram | EASY | 60.4 | 67% | Hash Table · String · Sorting |
| 19 | Two Sum | EASY | 60.4 | 56% | Array · Hash Table |
| 20 | First Missing Positive | HARD | 60.4 | 41% | Array · Hash Table |
| 21 | 3Sum | MEDIUM | 60.4 | 37% | Array · Two Pointers · Sorting |
| 22 | Largest Number | MEDIUM | 60.4 | 41% | Array · String · Greedy |
| 23 | Maximum Product of Three Numbers | EASY | 60.4 | 45% | Array · Math · Sorting |
| 24 | Group Anagrams | MEDIUM | 60.4 | 71% | Array · Hash Table · String |
| 25 | Angle Between Hands of a Clock | MEDIUM | 60.4 | 64% | Math |
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 Siemens OA. The proctor cannot see it. Screen share cannot detect it. Made by a working Amazon engineer who got tired of watching qualified friends bomb OAs they'd solve cold in an IDE.
Get StealthCoder- array14 · 56%
- sorting7 · 28%
- hash table7 · 28%
- string6 · 24%
- linked list5 · 20%
- two pointers4 · 16%
- stack3 · 12%
- greedy3 · 12%
- recursion3 · 12%
- binary indexed tree2 · 8%
Array problems are your foundation: 14 of 25 means you can't skip this. Hit the easy ones first (best time to buy and sell stock, contains duplicate, remove duplicates from sorted array) to build confidence, then move to harder array patterns like merge intervals and the skyline problem. Sorting and hash tables come next at 7 problems each. Linked list rounds out the top five at 5 problems, and two-pointers bridges array and linked-list work. Stack and string problems show up in medium-difficulty questions like valid parentheses and letter combinations. The hard problems (peaks in array, the skyline problem, LFU cache) mix advanced data structures like segment trees and binary indexed trees with classic patterns. If you hit a hard problem during your OA and feel stuck, StealthCoder surfaces the solution invisibly while you stay on camera.
Companies with similar patterns
If you prepped for Siemens, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass Siemens.
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 Amazon engineer who got tired of watching qualified friends bomb OAs they'd solve cold in an IDE. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Siemens interview FAQ
Should I drill array problems first for Siemens?+
Yes. Arrays appear in 14 of 25 problems reported. Start with the five easy ones (contains duplicate, best time to buy and sell stock, remove duplicates) to lock in fundamentals, then move to merge intervals and peaks in array to understand harder patterns. This covers over half the assessment.
How much time should I spend on sorting and hash tables?+
Both appear 7 times each. After arrays, sorting and hash tables are your second priority. Sorting pairs with arrays (merge intervals), and hash tables often appear in medium problems like letter combinations of a phone number and LFU cache. Allocate study time proportional to frequency.
Is linked list a major focus for Siemens?+
Linked list shows up 5 times, making it the fifth most common topic. All reported linked-list problems are easy or medium (reverse linked list, merge two sorted lists, rotate list). Get these three down solidly before moving to harder structures like segment trees or binary indexed trees.
What's the ratio of easy to hard, and should I worry about the hard ones?+
10 easy, 11 medium, 4 hard. You're more likely to face medium-difficulty questions. Spend 70% effort on easy and medium patterns. Don't obsess over hard problems like the skyline problem until you're confident on merge intervals and valid parentheses. That's where your points are.
Do I need to know segment trees and binary indexed trees for Siemens?+
They appear in 2 problems each, but both are hard (peaks in array, the skyline problem). If you're short on prep time, skip these and focus on the 21 other problems. These are hedge problems. If you've mastered arrays, sorting, hash tables, and linked lists, then learn segment trees.