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Arrays & Hashing Essentials

The first stop for interview prep: prefix sums, frequency maps and set tricks that unlock O(n) solutions.

3

Modules

8h

Duration

14

Students

500

Coins Reward

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Course Modules

1

Warm-up

Single passes and running totals.

2

Hash maps and sets

Counting and O(1) lookups.

3

Prefix sums and frequency

Turn range questions into lookups.