国外版

算法题（国外版）/longest-happy-string.html

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+<p>A string <code>s</code> is called <strong>happy</strong> if it satisfies the following conditions:</p>
+
+<ul>
+	<li><code>s</code> only contains the letters <code>&#39;a&#39;</code>, <code>&#39;b&#39;</code>, and <code>&#39;c&#39;</code>.</li>
+	<li><code>s</code> does not contain any of <code>&quot;aaa&quot;</code>, <code>&quot;bbb&quot;</code>, or <code>&quot;ccc&quot;</code> as a substring.</li>
+	<li><code>s</code> contains <strong>at most</strong> <code>a</code> occurrences of the letter <code>&#39;a&#39;</code>.</li>
+	<li><code>s</code> contains <strong>at most</strong> <code>b</code> occurrences of the letter <code>&#39;b&#39;</code>.</li>
+	<li><code>s</code> contains <strong>at most</strong> <code>c</code> occurrences of the letter <code>&#39;c&#39;</code>.</li>
+</ul>
+
+<p>Given three integers <code>a</code>, <code>b</code>, and <code>c</code>, return <em>the <strong>longest possible happy </strong>string</em>. If there are multiple longest happy strings, return <em>any of them</em>. If there is no such string, return <em>the empty string </em><code>&quot;&quot;</code>.</p>
+
+<p>A <strong>substring</strong> is a contiguous sequence of characters within a string.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> a = 1, b = 1, c = 7
+<strong>Output:</strong> &quot;ccaccbcc&quot;
+<strong>Explanation:</strong> &quot;ccbccacc&quot; would also be a correct answer.
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> a = 7, b = 1, c = 0
+<strong>Output:</strong> &quot;aabaa&quot;
+<strong>Explanation:</strong> It is the only correct answer in this case.
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>0 &lt;= a, b, c &lt;= 100</code></li>
+	<li><code>a + b + c &gt; 0</code></li>
+</ul>