You need to design an inventory system that supports multiple warehouses and tracks stock per warehouse. Which data structure best supports this requirement?

hard📝 Trade-off Q8 of 15

LLD - Design — Online Shopping Cart

AA nested dictionary with warehouse IDs as keys and item-quantity dictionaries as values

BA flat list of all items without warehouse info

CA single dictionary with item names as keys and total quantity as values

DA string listing all items and quantities

Step-by-Step Solution

Solution:

Step 1: Understand requirement for per-warehouse tracking
Each warehouse must have its own stock data separately.
Step 2: Match data structure to requirement
Nested dictionary allows warehouse IDs as keys, each mapping to item-quantity dictionaries.
Final Answer:
A nested dictionary with warehouse IDs as keys and item-quantity dictionaries as values -> Option A
Quick Check:
Per-warehouse stock = nested dictionary [OK]

Quick Trick: Use nested dictionaries for hierarchical inventory data [OK]

Common Mistakes:

Using flat list loses warehouse info
Single dictionary can't separate warehouses

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You need to design an inventory system that supports multiple warehouses and tracks stock per warehouse. Which data structure best supports this requirement?

Step 1: Understand requirement for per-warehouse tracking

Step 2: Match data structure to requirement

Final Answer:

Quick Check:

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