Daily Coding Problem: Problem #1363 [Easy]

Good morning! Here's your coding interview problem for today.

This problem was asked by Uber.

On election day, a voting machine writes data in the form (voter_id, candidate_id) to a text file. Write a program that reads this file as a stream and returns the top 3 candidates at any given time. If you find a voter voting more than once, report this as fraud.

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