Most Active User

Medium

📝 Description

Find the user who sent the most messages.

Input Format

[ {"sender": "Alice", "message": "Hi"}, {"sender": "Bob", "message": "Hello"}, {"sender": "Alice", "message": "Hey"} ]

Output Format

"Alice"

Constraints

Number of messages ≤ 10^5

🔍 Sample Input

[ {"sender": "Alice", "message": "Hi"}, {"sender": "Bob", "message": "Hello"}, {"sender": "Alice", "message": "Hey"} ]

✅ Sample Output

"Alice"

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