Vowels of All Substrings problem solved

Author: hasibulislam999

Combinatorics/2063_vowels-of-all-substrings.js

@@ -0,0 +1,23 @@
+/**
+ * Title: Vowels of All Substrings
+ * Description: Given a string word, return the sum of the number of vowels ('a', 'e', 'i', 'o', and 'u') in every substring of word.
+ * Author: Hasibul Islam
+ * Date: 03/05/2023
+ */
+
+/**
+ * @param {string} word
+ * @return {number}
+ */
+var countVowels = function (word) {
+  const vowels = new Set(["a", "e", "i", "o", "u"]);
+  let total = 0;
+  let count = 0;
+  for (let i = 0; i < word.length; i++) {
+    if (vowels.has(word[i])) {
+      count += i + 1;
+    }
+    total += count;
+  }
+  return total;
+};