word-subsets

Word Subsets

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wordSubsets

You are given two string arrays <code>words1</code> and <code>words2</code>.

A string <code>b</code> is a subset of string <code>a</code> if every letter in <code>b</code> occurs in <code>a</code> including multiplicity.

<ul>
	<li>For example, <code>&quot;wrr&quot;</code> is a subset of <code>&quot;warrior&quot;</code> but is not a subset of <code>&quot;world&quot;</code>.</li>
</ul>

A string <code>a</code> from <code>words1</code> is universal if for every string <code>b</code> in <code>words2</code>, <code>b</code> is a subset of <code>a</code>.

Return an array of all the universal strings in <code>words1</code>. You may return the answer in any order.

&nbsp;
Example 1:

<pre>
Input: words1 = [&quot;amazon&quot;,&quot;apple&quot;,&quot;facebook&quot;,&quot;google&quot;,&quot;leetcode&quot;], words2 = [&quot;e&quot;,&quot;o&quot;]
Output: [&quot;facebook&quot;,&quot;google&quot;,&quot;leetcode&quot;]
</pre>

Example 2:

<pre>
Input: words1 = [&quot;amazon&quot;,&quot;apple&quot;,&quot;facebook&quot;,&quot;google&quot;,&quot;leetcode&quot;], words2 = [&quot;l&quot;,&quot;e&quot;]
Output: [&quot;apple&quot;,&quot;google&quot;,&quot;leetcode&quot;]
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= words1.length, words2.length &lt;= 104</code></li>
	<li><code>1 &lt;= words1[i].length, words2[i].length &lt;= 10</code></li>
	<li><code>words1[i]</code> and <code>words2[i]</code> consist only of lowercase English letters.</li>
	<li>All the strings of <code>words1</code> are unique.</li>
</ul>

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