LLD - Design — Food Delivery System
Why is it important to handle duplicate keys carefully when storing ratings in a dictionary-like structure keyed by user ID?
Why is it important to handle duplicate keys carefully when storing ratings in a dictionary-like structure keyed by user ID?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand dictionary key behavior
In dictionaries, keys must be unique; duplicates overwrite old values.Step 2: Recognize impact on ratings
If user ID keys duplicate, previous ratings get lost, causing data loss.Final Answer:
Because duplicate keys overwrite previous ratings, losing data -> Option AQuick Check:
Duplicate keys cause overwrite = Data loss [OK]
Quick Trick: Duplicate keys overwrite values, so avoid them [OK]
Common Mistakes:
- Thinking duplicates speed retrieval
- Believing duplicates increase storage
- Assuming duplicates improve accuracy
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