solves #2586: Count the Number of Vowel Strings in Range in java

Author: anishLearnsToCode

README.md

@@ -806,7 +806,7 @@
 | 2574 | [Left and Right Sum Differences](https://leetcode.com/problems/left-and-right-sum-differences)                                                                         |                                                                                 [![Java](assets/java.png)](src/LeftAndRightSumDifferences.java)                                                                                  |                                                                                                                                   |
 | 2578 | [Split With Minimum Sum](https://leetcode.com/problems/split-with-minimum-sum)                                                                                         |                                                                                     [![Java](assets/java.png)](src/SplitWithMinimumSum.java)                                                                                     |                                                                                                                                   |
 | 2582 | [Pass the Pillow](https://leetcode.com/problems/pass-the-pillow)                                                                                                       |                                                                                        [![Java](assets/java.png)](src/PassThePillow.java)                                                                                        |                                                                                                                                   |
-| 2586 | [Count the Number of Vowel Strings in Range](https://leetcode.com/problems/count-the-number-of-vowel-strings-in-range)                                                 |                                                                                                                                                                                                                                  |                                                                                                                                   |
+| 2586 | [Count the Number of Vowel Strings in Range](https://leetcode.com/problems/count-the-number-of-vowel-strings-in-range)                                                 |                                                                             [![Java](assets/java.png)](src/CountTheNumberOfVowelStringsInRange.java)                                                                             |                                                                                                                                   |
 | 2591 | [Distribute Money to Maximum Children](https://leetcode.com/problems/distribute-money-to-maximum-children)                                                             |                                                                                                                                                                                                                                  |                                                                                                                                   |
 | 2595 | [Number of Even and Odd Bits](https://leetcode.com/problems/number-of-even-and-odd-bits)                                                                               |                                                                                                                                                                                                                                  |                                                                                                                                   |
 | 2600 | [K Items With the Maximum Sum](https://leetcode.com/problems/k-items-with-the-maximum-sum)                                                                             |                                                                                                                                                                                                                                  |                                                                                                                                   |

src/CountTheNumberOfVowelStringsInRange.java

@@ -0,0 +1,27 @@
+// https://leetcode.com/problems/count-the-number-of-vowel-strings-in-range
+// T: O(N)
+// S: O(1)
+
+import java.util.Set;
+
+public class CountTheNumberOfVowelStringsInRange {
+    private final static Set<Character> VOWELS = Set.of('a', 'e', 'i', 'o', 'u');
+
+    public int vowelStrings(String[] words, int left, int right) {
+        int vowelStrings = 0;
+        for (int i = left ; i <= right ; i++) {
+            if (isVowelString(words[i])) {
+                vowelStrings++;
+            }
+        }
+        return vowelStrings;
+    }
+
+    private boolean isVowelString(String word) {
+        return isVowel(word.charAt(0)) && isVowel(word.charAt(word.length() - 1));
+    }
+
+    private boolean isVowel(char c) {
+        return VOWELS.contains(c);
+    }
+}