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4054-count-distinct-integers-after-removing-zeros/README.md

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+<h2><a href="https://leetcode.com/problems/count-distinct-integers-after-removing-zeros">4054. Count Distinct Integers After Removing Zeros</a></h2><h3>Medium</h3><hr><p>You are given a <strong>positive</strong> integer <code>n</code>.</p>
+
+<p>For every integer <code>x</code> from 1 to <code>n</code>, we write down the integer obtained by removing all zeros from the decimal representation of <code>x</code>.</p>
+
+<p>Return an integer denoting the number of <strong>distinct</strong> integers written down.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<div class="example-block">
+<p><strong>Input:</strong> <span class="example-io">n = 10</span></p>
+
+<p><strong>Output:</strong> <span class="example-io">9</span></p>
+
+<p><strong>Explanation:</strong></p>
+
+<p>The integers we wrote down are 1, 2, 3, 4, 5, 6, 7, 8, 9, 1. There are 9 distinct integers (1, 2, 3, 4, 5, 6, 7, 8, 9).</p>
+</div>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<div class="example-block">
+<p><strong>Input:</strong> <span class="example-io">n = 3</span></p>
+
+<p><strong>Output:</strong> <span class="example-io">3</span></p>
+
+<p><strong>Explanation:</strong></p>
+
+<p>The integers we wrote down are 1, 2, 3. There are 3 distinct integers (1, 2, 3).</p>
+</div>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= n &lt;= 10<sup>15</sup></code></li>
+</ul>