Have I Seen This Before? Sets
Count the different members who came to the gym today, and know at each scan whether it's someone's first visit: why counting scans, a list and a dictionary of "true" each fall short, and how your language's set answers "have I seen this before?" in one step.
Updated
- Category
- Data Structures
- Level
- Apprentice
- Tags
- data structures, HashSet, HashSet<T>, Set (data-structures), Set (javascript), Set (python)