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2180-count-integers-with-even-digit-sum/README.md

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+<h2><a href="https://leetcode.com/problems/count-integers-with-even-digit-sum">2180. Count Integers With Even Digit Sum</a></h2><h3>Easy</h3><hr><p>Given a positive integer <code>num</code>, return <em>the number of positive integers <strong>less than or equal to</strong></em> <code>num</code> <em>whose digit sums are <strong>even</strong></em>.</p>
+
+<p>The <strong>digit sum</strong> of a positive integer is the sum of all its digits.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> num = 4
+<strong>Output:</strong> 2
+<strong>Explanation:</strong>
+The only integers less than or equal to 4 whose digit sums are even are 2 and 4.    
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> num = 30
+<strong>Output:</strong> 14
+<strong>Explanation:</strong>
+The 14 integers less than or equal to 30 whose digit sums are even are
+2, 4, 6, 8, 11, 13, 15, 17, 19, 20, 22, 24, 26, and 28.
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= num &lt;= 1000</code></li>
+</ul>