Stage 04 · 04 · Ship · skill 3 of 3

Data structures & algorithms

Arrays, lists, hash maps, trees and graphs with the classic algorithms and complexity analysis — typed out, not memorised, for interviews and for real code.

Recommended first: Python syntax & types, Functions & scope

After this you will be able to

• Implement and trace the core structures and algorithms
• State time and space complexity of a solution
• Apply recurring patterns (two pointers, sliding window, DP) under time pressure

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freeCodeCamp.org · why we picked it