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Author: adityaranjan2005

Lemonade Change/readme.md

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+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:
+
+Input: bills = [5,5,5,10,20]
+Output: true
+Explanation: 
+From the first 3 customers, we collect three $5 bills in order.
+From the fourth customer, we collect a $10 bill and give back a $5.
+From the fifth customer, we give a $10 bill and a $5 bill.
+Since all customers got correct change, we output true.
+Example 2:
+
+Input: bills = [5,5,10,10,20]
+Output: false
+Explanation: 
+From the first two customers in order, we collect two $5 bills.
+For the next two customers in order, we collect a $10 bill and give back a $5 bill.
+For the last customer, we can not give the change of $15 back because we only have two $10 bills.
+Since not every customer received the correct change, the answer is false.
+ 
+
+Constraints:
+
+1 <= bills.length <= 105
+bills[i] is either 5, 10, or 20.