国外版

算法题（国外版）/binary-watch.html

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+<p>A binary watch has 4 LEDs on the top which represent the hours (0-11), and the 6 LEDs on the bottom represent the minutes (0-59). Each LED represents a zero or one, with the least significant bit on the right.</p>
+
+<ul>
+	<li>For example, the below binary watch reads <code>&quot;4:51&quot;</code>.</li>
+</ul>
+
+<p><img alt="" src="https://assets.leetcode.com/uploads/2021/04/08/binarywatch.jpg" style="width: 500px; height: 500px;" /></p>
+
+<p>Given an integer <code>turnedOn</code> which represents the number of LEDs that are currently on, return <em>all possible times the watch could represent</em>. You may return the answer in <strong>any order</strong>.</p>
+
+<p>The hour must not contain a leading zero.</p>
+
+<ul>
+	<li>For example, <code>&quot;01:00&quot;</code> is not valid. It should be <code>&quot;1:00&quot;</code>.</li>
+</ul>
+
+<p>The minute must be consist of two digits and may contain a leading zero.</p>
+
+<ul>
+	<li>For example, <code>&quot;10:2&quot;</code> is not valid. It should be <code>&quot;10:02&quot;</code>.</li>
+</ul>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+<pre><strong>Input:</strong> turnedOn = 1
+<strong>Output:</strong> ["0:01","0:02","0:04","0:08","0:16","0:32","1:00","2:00","4:00","8:00"]
+</pre><p><strong>Example 2:</strong></p>
+<pre><strong>Input:</strong> turnedOn = 9
+<strong>Output:</strong> []
+</pre>
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>0 &lt;= turnedOn &lt;= 10</code></li>
+</ul>