# The ATM Problem: Why the Greedy Algorithm Isn't an Optimal Solution

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The ATM problem is a popular problem in FAANG interviews. It involves finding the minimum number of banknotes required to withdraw a certain sum of money from an ATM that contains banknotes of different denominations. In this article, we will explore the problem and its solution using the Greedy algorithm, as well as why the Greedy algorithm may not be suitable in all cases.