password-strength

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Algorithms

You are given a string <code>password</code>.

The strength of the password is calculated based on the following rules:

<ul>
	<li>1 point for each distinct lowercase letter (<code>&#39;a&#39;</code> to <code>&#39;z&#39;</code>).</li>
	<li>2 points for each distinct uppercase letter (<code>&#39;A&#39;</code> to <code>&#39;Z&#39;</code>).</li>
	<li>3 points for each distinct digit (<code>&#39;0&#39;</code> to <code>&#39;9&#39;</code>).</li>
	<li>5 points for each distinct special character from the set <code>&quot;!@#$&quot;</code>.</li>
</ul>

Each character contributes at most once, even if it appears multiple times.

Return an integer denoting the strength of the password.

&nbsp;
Example 1:

<div class="example-block">
Input: password = &quot;aA1!&quot;

Output: 11

Explanation:

<ul>
	<li>The distinct characters are <code>&#39;a&#39;</code>, <code>&#39;A&#39;</code>, <code>&#39;1&#39;</code> and <code>&#39;!&#39;</code>.</li>
	<li>Thus, the <code>strength = 1 + 2 + 3 + 5 = 11</code>.</li>
</ul>
</div>

Example 2:

<div class="example-block">
Input: password = &quot;bbB11#&quot;

Output: 11

Explanation:

<ul>
	<li>The distinct characters are <code>&#39;b&#39;</code>, <code>&#39;B&#39;</code>, <code>&#39;1&#39;</code> and <code>&#39;#&#39;</code>.</li>
	<li>Thus, the <code>strength = 1 + 2 + 3 + 5 = 11</code>.​​​​​​​</li>
</ul>
</div>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= password.length &lt;= 105</code></li>
	<li><code>password</code> consists of lowercase and uppercase English letters, digits, and special characters from <code>&quot;!@#$&quot;</code>.</li>
</ul>