Top Customers by Event Spend

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Your question is Top Customers by Event Spend. Start with the requirements on the right.

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Problem

Given a list of event records, write a function that returns summary insights per customer. Each record is a list in the form [customer_id, event_type, amount], where customer_id and event_type are strings and amount is a non-negative integer. Aggregate total amount per customer, count the number of events per customer, and return the top k customers sorted by descending total amount, then ascending customer_id for ties.

Constraints

1 <= len(records) <= 10^5
Each record has exactly 3 fields: [customer_id, event_type, amount]
1 <= len(customer_id), len(event_type) <= 20
0 <= amount <= 10^6
1 <= k <= number of distinct customer_id values

Function Signature

def top_customers(records, k):

Your solutionPython 3

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