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check-array-formation-through-concatenation/README.md

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+<h2>1640. Check Array Formation Through Concatenation</h2><h3>Easy</h3><hr><div><p>You are given an array of <strong>distinct</strong> integers <code>arr</code> and an array of integer arrays <code>pieces</code>, where the integers in <code>pieces</code> are <strong>distinct</strong>. Your goal is to form <code>arr</code> by concatenating the arrays in <code>pieces</code> <strong>in any order</strong>. However, you are <strong>not</strong> allowed to reorder the integers in each array <code>pieces[i]</code>.</p>
+
+<p>Return <code>true</code> <em>if it is possible </em><em>to form the array </em><code>arr</code><em> from </em><code>pieces</code>. Otherwise, return <code>false</code>.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre><strong>Input:</strong> arr = [85], pieces = [[85]]
+<strong>Output:</strong> true
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre><strong>Input:</strong> arr = [15,88], pieces = [[88],[15]]
+<strong>Output:</strong> true
+<strong>Explanation:</strong> Concatenate <code>[15]</code> then <code>[88]</code>
+</pre>
+
+<p><strong>Example 3:</strong></p>
+
+<pre><strong>Input:</strong> arr = [49,18,16], pieces = [[16,18,49]]
+<strong>Output:</strong> false
+<strong>Explanation:</strong> Even though the numbers match, we cannot reorder pieces[0].
+</pre>
+
+<p><strong>Example 4:</strong></p>
+
+<pre><strong>Input:</strong> arr = [91,4,64,78], pieces = [[78],[4,64],[91]]
+<strong>Output:</strong> true
+<strong>Explanation:</strong> Concatenate <code>[91]</code> then <code>[4,64]</code> then <code>[78]</code></pre>
+
+<p><strong>Example 5:</strong></p>
+
+<pre><strong>Input:</strong> arr = [1,3,5,7], pieces = [[2,4,6,8]]
+<strong>Output:</strong> false
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= pieces.length &lt;= arr.length &lt;= 100</code></li>
+	<li><code>sum(pieces[i].length) == arr.length</code></li>
+	<li><code>1 &lt;= pieces[i].length &lt;= arr.length</code></li>
+	<li><code>1 &lt;= arr[i], pieces[i][j] &lt;= 100</code></li>
+	<li>The integers in&nbsp;<code>arr</code>&nbsp;are <strong>distinct</strong>.</li>
+	<li>The integers in&nbsp;<code>pieces</code> are <strong>distinct</strong>&nbsp;(i.e., If we flatten pieces in a 1D array, all the integers in this array are distinct).</li>
+</ul>
+</div>