Minimum Absolute Difference
<p>Given an array of <strong>distinct</strong> integers <code>arr</code>, find all pairs of elements with the minimum absolute difference of any two elements.</p>

<p>Return a list of pairs in ascending order(with respect to pairs), each pair <code>[a, b]</code> follows</p>

<ul>
	<li><code>a, b</code> are from <code>arr</code></li>
	<li><code>a &lt; b</code></li>
	<li><code>b - a</code> equals to the minimum absolute difference of any two elements in <code>arr</code></li>
</ul>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>

<pre>
<strong>Input:</strong> arr = [4,2,1,3]
<strong>Output:</strong> [[1,2],[2,3],[3,4]]
<strong>Explanation: </strong>The minimum absolute difference is 1. List all pairs with difference equal to 1 in ascending order.</pre>

<p><strong class="example">Example 2:</strong></p>

<pre>
<strong>Input:</strong> arr = [1,3,6,10,15]
<strong>Output:</strong> [[1,3]]
</pre>

<p><strong class="example">Example 3:</strong></p>

<pre>
<strong>Input:</strong> arr = [3,8,-10,23,19,-4,-14,27]
<strong>Output:</strong> [[-14,-10],[19,23],[23,27]]
</pre>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>2 &lt;= arr.length &lt;= 10<sup>5</sup></code></li>
	<li><code>-10<sup>6</sup> &lt;= arr[i] &lt;= 10<sup>6</sup></code></li>
</ul>
Array; Sorting
function minimumAbsDifference(arr: number[]): number[][] {
    arr.sort((a, b) => a - b);
    let mi = 1 << 30;
    const n = arr.length;
    for (let i = 0; i < n - 1; ++i) {
        mi = Math.min(mi, arr[i + 1] - arr[i]);
    }
    const ans: number[][] = [];
    for (let i = 0; i < n - 1; ++i) {
        if (arr[i + 1] - arr[i] === mi) {
            ans.push([arr[i], arr[i + 1]]);
        }
    }
    return ans;
}
