Problem database last updated: June 20, 2025
3 problems · 2 Easy, 1 Medium, 0 Hard · Ranked #309 of 458
2 Easy
67% · avg 23%
1 Medium
33% · avg 59%
0 Hard
0% · avg 18%
Based on 3 reported problems, Wissen Technology interviews are easier than average - only 0% Hard compared to 18% across all companies.
The most common topics are array (66.7%), hash-map (33.3%), hash-table (33.3%), union-find (33.3%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Two Sum Given an array of integers nums and an integer target, return the indices of the two numbers that add up to target. | Easy | Very Likely | arrayhash-map | Solve |
Longest Consecutive Sequence Given an unsorted array of integers nums, return the length of the longest consecutive elements sequence. | Medium | Very Likely | arrayhash-tableunion-find | Solve |
Reverse Words in a String III Given a string s, reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order. | Easy | Very Likely | two-pointersstring | Solve |
Two Sum
SolveGiven an array of integers nums and an integer target, return the indices of the two numbers that add up to target.
Longest Consecutive Sequence
SolveGiven an unsorted array of integers nums, return the length of the longest consecutive elements sequence.
Reverse Words in a String III
SolveGiven a string s, reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Wissen Technology interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Wissen Technology interviews focus heavily on array, hash-map, hash-table problems. If you're short on time, these are the categories to prioritize. The problems on this page are sorted by frequency, so start from the top and work your way down.
Beyond solving problems, practice explaining your approach. Wissen Technology interviewers care about your thought process - how you break down a problem, consider edge cases, and evaluate tradeoffs between solutions. A clean O(n) solution you can explain clearly beats an O(log n) solution you can't articulate.
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Wissen Technology has been reported to ask 3 distinct coding problems. The most common topics are array, hash-map, hash-table. 2 are Easy difficulty, 1 are Medium, and 0 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 3 reported problems, Wissen Technology interviews are easier than average - only 0% Hard compared to 18% across all companies. 33% of questions are Medium difficulty. Focus on the high-frequency Medium problems first, then work through the Hard ones.
Start with the highest-frequency problems listed on this page. Focus on the core topics: array, hash-map, hash-table. Practice solving them under time pressure and explaining your approach out loud. Mock interviews with AI can simulate the real experience.
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