[Solved] Given this simplified transaction record list:transactions = [ {"id": "t1", "time": "2024-01-01T10:00:00Z"}, {"id": "t2", "time": "2024-01-01T09:00:00Z"}, {"id": "t3", "time":... | LLD

LLD - Design — Splitwise (Expense Sharing)

Given this simplified transaction record list:

transactions = [
  {"id": "t1", "time": "2024-01-01T10:00:00Z"},
  {"id": "t2", "time": "2024-01-01T09:00:00Z"},
  {"id": "t3", "time": "2024-01-01T11:00:00Z"}
]

What is the correct order of transaction IDs if sorted by time ascending?

A["t1", "t2", "t3"]

B["t2", "t3", "t1"]

C["t3", "t1", "t2"]

D["t2", "t1", "t3"]

Step-by-Step Solution

Solution:

Step 1: Analyze timestamps for each transaction
t2 = 09:00, t1 = 10:00, t3 = 11:00 in UTC time.
Step 2: Sort transactions by ascending time
Order is t2 (earliest), then t1, then t3 (latest).
Final Answer:
["t2", "t1", "t3"] -> Option D
Quick Check:
Sorted by time ascending = [t2, t1, t3] [OK]

Quick Trick: Sort by timestamp ascending for correct order [OK]

Common Mistakes:

MISTAKES

Sorting by ID instead of time
Confusing ascending with descending order
Ignoring timestamp format

Master "Design — Splitwise (Expense Sharing)" in LLD

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Arch Try Challenge Design Recall Scale

More LLD Quizzes

Given this simplified transaction record list:

Step 1: Analyze timestamps for each transaction

Step 2: Sort transactions by ascending time

Final Answer:

Quick Check:

Want More Practice?