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leetcode/problem/strong-password-checker.html

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+<p>A password is considered strong if the below conditions are all met:</p>
+
+<ul>
+	<li>It has at least <code>6</code> characters and at most <code>20</code> characters.</li>
+	<li>It contains at least <strong>one lowercase</strong> letter, at least <strong>one uppercase</strong> letter, and at least <strong>one digit</strong>.</li>
+	<li>It does&nbsp;not contain three repeating characters in a row (i.e.,&nbsp;<code>&quot;...aaa...&quot;</code> is weak, but <code>&quot;...aa...a...&quot;</code> is strong, assuming other conditions are met).</li>
+</ul>
+
+<p>Given a string <code>password</code>, return <em>the minimum number of steps required to make <code>password</code> strong. if <code>password</code> is already strong, return <code>0</code>.</em></p>
+
+<p>In one step, you can:</p>
+
+<ul>
+	<li>Insert one character to <code>password</code>,</li>
+	<li>Delete one character from <code>password</code>, or</li>
+	<li>Replace&nbsp;one character of <code>password</code> with another character.</li>
+</ul>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+<pre><strong>Input:</strong> password = "a"
+<strong>Output:</strong> 5
+</pre><p><strong>Example 2:</strong></p>
+<pre><strong>Input:</strong> password = "aA1"
+<strong>Output:</strong> 3
+</pre><p><strong>Example 3:</strong></p>
+<pre><strong>Input:</strong> password = "1337C0d3"
+<strong>Output:</strong> 0
+</pre>
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= password.length &lt;= 50</code></li>
+	<li><code>password</code> consists of letters, digits, dot&nbsp;<code>&#39;.&#39;</code> or exclamation mark <code>&#39;!&#39;</code>.</li>
+</ul>