count-the-number-of-vowel-strings-in-range

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Algorithms

You are given a 0-indexed array of string <code>words</code> and two integers <code>left</code> and <code>right</code>.

A string is called a vowel string if it starts with a vowel character and ends with a vowel character where vowel characters are <code>&#39;a&#39;</code>, <code>&#39;e&#39;</code>, <code>&#39;i&#39;</code>, <code>&#39;o&#39;</code>, and <code>&#39;u&#39;</code>.

Return the number of vowel strings <code>words[i]</code> where <code>i</code> belongs to the inclusive range <code>[left, right]</code>.

&nbsp;
Example 1:

<pre>
Input: words = [&quot;are&quot;,&quot;amy&quot;,&quot;u&quot;], left = 0, right = 2
Output: 2
Explanation: 
- &quot;are&quot; is a vowel string because it starts with &#39;a&#39; and ends with &#39;e&#39;.
- &quot;amy&quot; is not a vowel string because it does not end with a vowel.
- &quot;u&quot; is a vowel string because it starts with &#39;u&#39; and ends with &#39;u&#39;.
The number of vowel strings in the mentioned range is 2.
</pre>

Example 2:

<pre>
Input: words = [&quot;hey&quot;,&quot;aeo&quot;,&quot;mu&quot;,&quot;ooo&quot;,&quot;artro&quot;], left = 1, right = 4
Output: 3
Explanation: 
- &quot;aeo&quot; is a vowel string because it starts with &#39;a&#39; and ends with &#39;o&#39;.
- &quot;mu&quot; is not a vowel string because it does not start with a vowel.
- &quot;ooo&quot; is a vowel string because it starts with &#39;o&#39; and ends with &#39;o&#39;.
- &quot;artro&quot; is a vowel string because it starts with &#39;a&#39; and ends with &#39;o&#39;.
The number of vowel strings in the mentioned range is 3.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= words.length &lt;= 1000</code></li>
	<li><code>1 &lt;= words[i].length &lt;= 10</code></li>
	<li><code>words[i]</code> consists of only lowercase English letters.</li>
	<li><code>0 &lt;= left &lt;= right &lt; words.length</code></li>
</ul>

vowelStrings

Count the Number of Vowel Strings in Range

Array

String

Counting

给你一个下标从 0 开始的字符串数组 <code>words</code> 和两个整数：<code>left</code> 和 <code>right</code> 。

如果字符串以元音字母开头并以元音字母结尾，那么该字符串就是一个 元音字符串 ，其中元音字母是 <code>'a'</code>、<code>'e'</code>、<code>'i'</code>、<code>'o'</code>、<code>'u'</code> 。

返回 <code>words[i]</code> 是元音字符串的数目，其中 <code>i</code> 在闭区间 <code>[left, right]</code> 内。

&nbsp;

示例 1：

<pre>
输入：words = ["are","amy","u"], left = 0, right = 2
输出：2
解释：
- "are" 是一个元音字符串，因为它以 'a' 开头并以 'e' 结尾。
- "amy" 不是元音字符串，因为它没有以元音字母结尾。
- "u" 是一个元音字符串，因为它以 'u' 开头并以 'u' 结尾。
在上述范围中的元音字符串数目为 2 。
</pre>

示例 2：

<pre>
输入：words = ["hey","aeo","mu","ooo","artro"], left = 1, right = 4
输出：3
解释：
- "aeo" 是一个元音字符串，因为它以 'a' 开头并以 'o' 结尾。
- "mu" 不是元音字符串，因为它没有以元音字母开头。
- "ooo" 是一个元音字符串，因为它以 'o' 开头并以 'o' 结尾。
- "artro" 是一个元音字符串，因为它以 'a' 开头并以 'o' 结尾。
在上述范围中的元音字符串数目为 3 。
</pre>

&nbsp;

提示：

<ul>
	<li><code>1 &lt;= words.length &lt;= 1000</code></li>
	<li><code>1 &lt;= words[i].length &lt;= 10</code></li>
	<li><code>words[i]</code> 仅由小写英文字母组成</li>
	<li><code>0 &lt;= left &lt;= right &lt; words.length</code></li>
</ul>