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Intermediate 9 lessons · free

DSA tutorial Patterns for coding interviews, in Python.

Data structures & algorithms — crack the coding round. Every lesson has a runnable Python solution you can edit and test, key points, a practice task, a quiz and interview questions.

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Lessons

What you'll learn

  1. 01Big-O & complexityMeasuring how time and memory grow with input size.
  2. 02Arrays & two pointersSolving array problems in one pass with two moving indexes.
  3. 03Hash maps & setsConstant-time lookups for counting, grouping and finding pairs.
  4. 04Stacks & queuesLIFO and FIFO structures and the problems they solve.
  5. 05Linked listsNodes and pointers: reversing, finding the middle and detecting cycles.
  6. 06Recursion & backtrackingFunctions that call themselves, base cases, memoisation and generating combinations.
  7. 07Binary searchHalving the search space on sorted data — and on answers.
  8. 08Sorting algorithmsBubble, merge and quick sort, stability, and using Python's sort with keys.
  9. 09Trees & graphs: BFS and DFSTraversing trees and graphs, shortest paths in unweighted graphs.