Added README.md file for Minimum Absolute Distance Between Mirror Pairs

Author: joshua-dierickse-alt

4139-minimum-absolute-distance-between-mirror-pairs/README.md

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+<h2><a href="https://leetcode.com/problems/minimum-absolute-distance-between-mirror-pairs">Minimum Absolute Distance Between Mirror Pairs</a></h2> <img src='https://img.shields.io/badge/Difficulty-Medium-orange' alt='Difficulty: Medium' /><hr><p>You are given an integer array <code>nums</code>.</p>
+
+<p>A <strong>mirror pair</strong> is a pair of indices <code>(i, j)</code> such that:</p>
+
+<ul>
+	<li><code>0 &lt;= i &lt; j &lt; nums.length</code>, and</li>
+	<li><code>reverse(nums[i]) == nums[j]</code>, where <code>reverse(x)</code> denotes the integer formed by reversing the digits of <code>x</code>. Leading zeros are omitted after reversing, for example <code>reverse(120) = 21</code>.</li>
+</ul>
+
+<p>Return the <strong>minimum</strong> absolute distance between the indices of any mirror pair. The absolute distance between indices <code>i</code> and <code>j</code> is <code>abs(i - j)</code>.</p>
+
+<p>If no mirror pair exists, return <code>-1</code>.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<div class="example-block">
+<p><strong>Input:</strong> <span class="example-io">nums = [12,21,45,33,54]</span></p>
+
+<p><strong>Output:</strong> <span class="example-io">1</span></p>
+
+<p><strong>Explanation:</strong></p>
+
+<p>The mirror pairs are:</p>
+
+<ul>
+	<li>(0, 1) since <code>reverse(nums[0]) = reverse(12) = 21 = nums[1]</code>, giving an absolute distance <code>abs(0 - 1) = 1</code>.</li>
+	<li>(2, 4) since <code>reverse(nums[2]) = reverse(45) = 54 = nums[4]</code>, giving an absolute distance <code>abs(2 - 4) = 2</code>.</li>
+</ul>
+
+<p>The minimum absolute distance among all pairs is 1.</p>
+</div>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<div class="example-block">
+<p><strong>Input:</strong> <span class="example-io">nums = [120,21]</span></p>
+
+<p><strong>Output:</strong> <span class="example-io">1</span></p>
+
+<p><strong>Explanation:</strong></p>
+
+<p>There is only one mirror pair (0, 1) since <code>reverse(nums[0]) = reverse(120) = 21 = nums[1]</code>.</p>
+
+<p>The minimum absolute distance is 1.</p>
+</div>
+
+<p><strong class="example">Example 3:</strong></p>
+
+<div class="example-block">
+<p><strong>Input:</strong> <span class="example-io">nums = [21,120]</span></p>
+
+<p><strong>Output:</strong> <span class="example-io">-1</span></p>
+
+<p><strong>Explanation:</strong></p>
+
+<p>There are no mirror pairs in the array.</p>
+</div>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= nums.length &lt;= 10<sup>5</sup></code></li>
+	<li><code>1 &lt;= nums[i] &lt;= 10<sup>9</sup></code>​​​​​​​</li>
+</ul>