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Question

You are processing a log file with three columns: a timestamp, an account number (a string), and a transaction amount (a number). You need to efficiently calculate the total transaction amount for every unique account number.

Which data structure should you use?

A A linked list
B A hash table
C A two-dimensional array
D A comma-delimited string

Explanation

A hash table stores each account number as a key and its cumulative transaction amount as the associated value, enabling efficient lookup and update while processing each log entry.

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