Problem database last updated: June 20, 2025
2 problems · 0 Easy, 1 Medium, 1 Hard · Ranked #426 of 458
0 Easy
0% · avg 23%
1 Medium
50% · avg 59%
1 Hard
50% · avg 18%
Based on 2 reported problems, Stackline interviews are significantly harder than average - 50% Hard vs 18% across all companies.
The most common topics are depth-first-search (50%), breadth-first-search (50%), graph (50%), topological-sort (50%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Minimum Height Trees A tree is an undirected graph in which any two vertices are connected by exactly one path. In other words, any connected graph without simple cycles is a tree. | Medium | Very Likely | depth-first-searchbreadth-first-searchgraph | Solve |
IPO Suppose LeetCode will start its IPO soon. In order to sell a good price of its shares to Venture Capital, LeetCode would like to work on some projects to increa... | Hard | Very Likely | arraygreedysorting | Solve |
Minimum Height Trees
SolveA tree is an undirected graph in which any two vertices are connected by exactly one path. In other words, any connected graph without simple cycles is a tree.
IPO
SolveSuppose LeetCode will start its IPO soon. In order to sell a good price of its shares to Venture Capital, LeetCode would like to work on some projects to increa...
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Stackline interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Stackline interviews focus heavily on depth-first-search, breadth-first-search, graph 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. Stackline 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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Stackline has been reported to ask 2 distinct coding problems. The most common topics are depth-first-search, breadth-first-search, graph. 0 are Easy difficulty, 1 are Medium, and 1 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 2 reported problems, Stackline interviews are significantly harder than average - 50% Hard vs 18% across all companies. 50% 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: depth-first-search, breadth-first-search, graph. 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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