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+<h2>unknown-problem</h2><h3>Easy</h3><hr><div><p>At a lemonade stand, each lemonade costs <code>$5</code>.&nbsp;</p>
+
+<p>Customers are standing in a queue to buy from you, and order one at a time (in the order specified by <code>bills</code>).</p>
+
+<p>Each customer will only buy one lemonade and&nbsp;pay with either a <code>$5</code>, <code>$10</code>, or <code>$20</code> bill.&nbsp; You must provide the correct change to each customer, so that the net transaction is that the customer pays $5.</p>
+
+<p>Note that you don't have any change&nbsp;in hand at first.</p>
+
+<p>Return <code>true</code>&nbsp;if and only if you can provide every customer with correct change.</p>
+
+<p>&nbsp;</p>
+
+<div>
+<p><strong>Example 1:</strong></p>
+
+<pre><strong>Input: </strong><span id="example-input-1-1">[5,5,5,10,20]</span>
+<strong>Output: </strong><span id="example-output-1">true</span>
+<strong>Explanation: </strong>
+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.
+</pre>
+
+<div>
+<p><strong>Example 2:</strong></p>
+
+<pre><strong>Input: </strong><span id="example-input-2-1">[5,5,10]</span>
+<strong>Output: </strong><span id="example-output-2">true</span>
+</pre>
+
+<div>
+<p><strong>Example 3:</strong></p>
+
+<pre><strong>Input: </strong><span id="example-input-3-1">[10,10]</span>
+<strong>Output: </strong><span id="example-output-3">false</span>
+</pre>
+
+<div>
+<p><strong>Example 4:</strong></p>
+
+<pre><strong>Input: </strong><span id="example-input-4-1">[5,5,10,10,20]</span>
+<strong>Output: </strong><span id="example-output-4">false</span>
+<strong>Explanation: </strong>
+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't give change of $15 back because we only have two $10 bills.
+Since not every customer received correct change, the answer is false.
+</pre>
+
+<p>&nbsp;</p>
+
+<p><strong><span>Note:</span></strong></p>
+
+<ul>
+	<li><code>0 &lt;= bills.length &lt;= 10000</code></li>
+	<li><code>bills[i]</code>&nbsp;will be either&nbsp;<code>5</code>, <code>10</code>, or <code>20</code>.</li>
+</ul>
+</div>
+</div>
+</div>
+</div>
+</div>