What is 'trading space for time'?
It means allocating extra memory (like creating a Hash Set) to store data for instant retrieval, avoiding the need for slow, repetitive loop calculations.
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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.
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.
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.
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