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<p>Given a string <code>s</code> and an integer <code>k</code>, return the total number of <span data-keyword="substring-nonempty">substrings</span> of <code>s</code> where <strong>at least one</strong> character appears <strong>at least</strong> <code>k</code> times.</p>
<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">s = &quot;abacb&quot;, k = 2</span></p>
<p><strong>Output:</strong> <span class="example-io">4</span></p>
<p><strong>Explanation:</strong></p>
<p>The valid substrings are:</p>
<ul>
<li><code>&quot;aba&quot;</code> (character <code>&#39;a&#39;</code> appears 2 times).</li>
<li><code>&quot;abac&quot;</code> (character <code>&#39;a&#39;</code> appears 2 times).</li>
<li><code>&quot;abacb&quot;</code> (character <code>&#39;a&#39;</code> appears 2 times).</li>
<li><code>&quot;bacb&quot;</code> (character <code>&#39;b&#39;</code> appears 2 times).</li>
</ul>
</div>
<p><strong class="example">Example 2:</strong></p>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">s = &quot;abcde&quot;, k = 1</span></p>
<p><strong>Output:</strong> <span class="example-io">15</span></p>
<p><strong>Explanation:</strong></p>
<p>All substrings are valid because every character appears at least once.</p>
</div>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>1 &lt;= s.length &lt;= 3000</code></li>
<li><code>1 &lt;= k &lt;= s.length</code></li>
<li><code>s</code> consists only of lowercase English letters.</li>
</ul>