The answer
Yes, you should verbally explain it or quickly write it to establish a working brute-force baseline, but you must immediately follow up by optimizing it.
Why You Should Avoid Nested Loops When Possible
Should I write a nested loop in an interview?
More FAQs in Why You Should Avoid Nested Loops When Possible
Because they create O(N^2) quadratic time complexity, which scales terribly. As data grows, execution time explodes, causing performance bottlenecks.
A Hash Map stores previous loop data in memory with O(1) instant lookup. Instead of an inner loop searching for a value, the code just asks the Hash Map if it exists.
Yes, for intrinsically multi-dimensional tasks, like traversing a 2D matrix or processing an image grid, nested loops are strictly required and optimal.
Still have questions?
Browse all our FAQs or reach out to our support team
Want to upskill yourself?
Your learning library
Small steps. Big possibilities.
Find your next course. Build something great.