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countTheNumberOfVowelStringsInRange.js
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countTheNumberOfVowelStringsInRange.js
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// LeetCode #2586. Count the Number of Vowel Strings in Range
/* Instructions
* You are given a 0-indexed array of string words and two integers left and right.
A string is called a vowel string if it starts with a vowel character and ends with a vowel character where vowel characters are 'a', 'e', 'i', 'o', and 'u'.
Return the number of vowel strings words[i] where i belongs to the inclusive range [left, right].
Example 1:
Input: words = ["are","amy","u"], left = 0, right = 2
Output: 2
Explanation:
- "are" is a vowel string because it starts with 'a' and ends with 'e'.
- "amy" is not a vowel string because it does not end with a vowel.
- "u" is a vowel string because it starts with 'u' and ends with 'u'.
The number of vowel strings in the mentioned range is 2.
Example 2:
Input: words = ["hey","aeo","mu","ooo","artro"], left = 1, right = 4
Output: 3
Explanation:
- "aeo" is a vowel string because it starts with 'a' and ends with 'o'.
- "mu" is not a vowel string because it does not start with a vowel.
- "ooo" is a vowel string because it starts with 'o' and ends with 'o'.
- "artro" is a vowel string because it starts with 'a' and ends with 'o'.
The number of vowel strings in the mentioned range is 3.
Constraints:
1 <= words.length <= 1000
1 <= words[i].length <= 10
words[i] consists of only lowercase English letters.
0 <= left <= right < words.length
*/
// Solution
function vowelStrings(words, left, right) {
// instantiate count
let count = 0;
// loop through words array range
for (let i = left; i <= right; i++) {
// check if word starts with vowel
if (
(words[i].startsWith("a") ||
words[i].startsWith("e") ||
words[i].startsWith("i") ||
words[i].startsWith("o") ||
words[i].startsWith("u")) &&
// check if word ends with vowel
(words[i].endsWith("a") ||
words[i].endsWith("e") ||
words[i].endsWith("i") ||
words[i].endsWith("o") ||
words[i].endsWith("u"))
) {
// if so, increment count
count++;
}
}
// return count
return count
}