Problem database last updated: June 20, 2025
1 problems · 0 Easy, 1 Medium, 0 Hard · Ranked #449 of 458
0 Easy
0% · avg 23%
1 Medium
100% · avg 59%
0 Hard
0% · avg 18%
Based on 1 reported problems, BILL Holdings interviews are easier than average - only 0% Hard compared to 18% across all companies. The majority (100%) of questions are Medium difficulty, which is typical for companies that want to see solid fundamentals without excessive trick questions.
The most common topics are array (100%), depth-first-search (100%), breadth-first-search (100%), union-find (100%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Number of Islands Given an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands. | Medium | Very Likely | arraydepth-first-searchbreadth-first-search | Solve |
Number of Islands
SolveGiven an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent BILL Holdings interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
BILL Holdings interviews focus heavily on array, depth-first-search, breadth-first-search 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. BILL Holdings 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.
Looking for more companies? Browse all 458 companies in our directory, or sharpen your fundamentals with our free data structure visualizers and AI-powered DSA tutor.
BILL Holdings has been reported to ask 1 distinct coding problems. The most common topics are array, depth-first-search, breadth-first-search. 0 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 1 reported problems, BILL Holdings interviews are easier than average - only 0% Hard compared to 18% across all companies. 100% 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, depth-first-search, breadth-first-search. 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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