860. Lemonade Change
Difficulty: Easy
Topics: Array, Greedy
At a lemonade stand, each lemonade costs $5. Customers are standing in a queue to buy from you and order one at a time (in the order specified by bills). Each customer will only buy one lemonade and pay with either a $5, $10, or $20 bill. You must provide the correct change to each customer so that the net transaction is that the customer pays $5.
Note that you do not have any change in hand at first.
Given an integer array bills where bills[i] is the bill the ith customer pays, return true if you can provide every customer with the correct change, or false otherwise.
Example 1:
Example 2:
Constraints:
Solution:
We need to simulate the process of providing change to customers based on the bills they use to pay. The key is to track the number of $5 and $10 bills you have, as these are needed to provide change for larger bills
Let's implement this solution in PHP: 860. Lemonade Change
Initialization: We start with $five and $ten set to 0, representing the count of $5 and $10 bills we have.
Processing Each Bill:
Final Check: If we've successfully processed all customers without running out of change, return true.
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