Connect it. Test it. Ship it. / CORE PATH
Useful problem-solving patterns
Choose structures by the operation you need to perform.
Use LeetCode as targeted practice for mapping, grouping and lookup.
Understand the idea
Choose structures by the operation you need to perform. Use LeetCode as targeted practice for mapping, grouping and lookup.
Work through the practice with a tiny fixture, predict the result before running it, and record one boundary case. Use the exit check as evidence before moving on.
What to learn
- Compare list scans with set/dict membership.
- Practice frequency counts and two-pointer reasoning.
- Explain time and memory growth using a small example.
Practice on your own data
Solve two fresh dictionary/set problems and explain your complexity aloud.
Practice this lesson in the Python lab →
EXIT CHECK
You can explain the tradeoff and test empty, repeated and large inputs.
Prerequisites
Sets & reconciliation · Loops & accumulation
Sources and further reading
- Python language tutorial ↗Official documentation
- Harvard CS50P · lectures & problem sets ↗User-selected HarvardX CS50P course
Track progress on this topic → · Markdown source ↗
Next lesson: Publish evidence & choose your next step →