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Data Structures & AlgorithmsComplexity analysis up to graphs and DP.Operating SystemsProcesses, scheduling, memory and concurrency.Database Management SystemsRelational modelling, transactions and indexing.Computer NetworksFrom wires and radio waves up to the web.

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Data Structures & Algorithms

Python Essentials1

Arrays & Strings4

Searching & Sorting14

Hash Maps and Sets
How a Hash Map Actually Works Inside

String Algorithms4

Stacks & Queues2

Heaps & Priority Queues1

Greedy & Backtracking2

Dynamic Programming5

Bit Manipulation1

Advanced Structures4

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Data Structures & Algorithms

Python Essentials1

Arrays & Strings4

Searching & Sorting14

Hash Maps and Sets
How a Hash Map Actually Works Inside

String Algorithms4

Stacks & Queues2

Heaps & Priority Queues1

Greedy & Backtracking2

Dynamic Programming5

Bit Manipulation1

Advanced Structures4

Learn Data Structures & AlgorithmsHashing

Hashing

2 lessons

1
Hash Maps and Sets
Trade memory for near-constant lookups, and learn the handful of patterns that solve a huge share of interview problems.
9 min read
2
How a Hash Map Actually Works Inside
Peek under the hood at hash functions, load factor and resizing, and see why the answer is still O(1) on average.
9 min read

Hashing Quiz8 questions · pass mark 60%