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Arrays & Hashing
Which operation is O(n) on an unsorted array?
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18 topics to master data structures
and algorithms.
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Don't just read about algorithms.
Do them.
Actively solve questions — fill in blanks, order steps, and choose the right technique. No passive reading.
A hash map lookup is O(1) on average, but degrades to ____ worst case.
Correct!
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18 units.
One path.
From arrays to dynamic programming. The exact order that makes sense for interview prep.