Package g0801_0900.s0860_lemonade_change

Class Solution

java.lang.Object

g0801_0900.s0860_lemonade_change.Solution

public class Solution
extends Object

860 - Lemonade Change.<p>Easy</p> <p>At a lemonade stand, each lemonade costs <code>$5</code>. 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 <code>$5</code>, <code>$10</code>, or <code>$20</code> bill. You must provide the correct change to each customer so that the net transaction is that the customer pays <code>$5</code>.</p> <p>Note that you do not have any change in hand at first.</p> <p>Given an integer array <code>bills</code> where <code>bills[i]</code> is the bill the <code>i^th</code> customer pays, return <code>true</code> <em>if you can provide every customer with the correct change, or</em> <code>false</code> <em>otherwise</em>.</p> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> bills = [5,5,5,10,20]</p> <p><strong>Output:</strong> true</p> <p><strong>Explanation:</strong></p> <p>From the first 3 customers, we collect three $5 bills in order.</p> <p>From the fourth customer, we collect a $10 bill and give back a $5.</p> <p>From the fifth customer, we give a $10 bill and a $5 bill.</p> <p>Since all customers got correct change, we output true.</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> bills = [5,5,10,10,20]</p> <p><strong>Output:</strong> false</p> <p><strong>Explanation:</strong></p> <p>From the first two customers in order, we collect two $5 bills.</p> <p>For the next two customers in order, we collect a $10 bill and give back a $5 bill.</p> <p>For the last customer, we can not give the change of $15 back because we only have two $10 bills.</p> <p>Since not every customer received the correct change, the answer is false.</p> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= bills.length <= 10⁵</code></li> <li><code>bills[i]</code> is either <code>5</code>, <code>10</code>, or <code>20</code>.</li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
boolean	lemonadeChange(int[] bills)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

lemonadeChange

public boolean lemonadeChange(int[] bills)