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Author: jimit105

2292-counting-words-with-a-given-prefix/README.md

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+<p>You are given an array of strings <code>words</code> and a string <code>pref</code>.</p>
+
+<p>Return <em>the number of strings in </em><code>words</code><em> that contain </em><code>pref</code><em> as a <strong>prefix</strong></em>.</p>
+
+<p>A <strong>prefix</strong> of a string <code>s</code> is any leading contiguous substring of <code>s</code>.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> words = [&quot;pay&quot;,&quot;<strong><u>at</u></strong>tention&quot;,&quot;practice&quot;,&quot;<u><strong>at</strong></u>tend&quot;], <code>pref </code>= &quot;at&quot;
+<strong>Output:</strong> 2
+<strong>Explanation:</strong> The 2 strings that contain &quot;at&quot; as a prefix are: &quot;<u><strong>at</strong></u>tention&quot; and &quot;<u><strong>at</strong></u>tend&quot;.
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> words = [&quot;leetcode&quot;,&quot;win&quot;,&quot;loops&quot;,&quot;success&quot;], <code>pref </code>= &quot;code&quot;
+<strong>Output:</strong> 0
+<strong>Explanation:</strong> There are no strings that contain &quot;code&quot; as a prefix.
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= words.length &lt;= 100</code></li>
+	<li><code>1 &lt;= words[i].length, pref.length &lt;= 100</code></li>
+	<li><code>words[i]</code> and <code>pref</code> consist of lowercase English letters.</li>
+</ul>

2292-counting-words-with-a-given-prefix/solution.py

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+# Approach 2: Built-in Methods
+
+# n = length of input array, m = length of the prefix string
+# Time: O(m * n)
+# Space: O(1)
+
+class Solution:
+    def prefixCount(self, words: List[str], pref: str) -> int:
+        return sum(word.startswith(pref) for word in words)
+