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LeetCode 2063: Vowels of All Substrings Solution

Master LeetCode problem 2063 (Vowels of All Substrings), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

2063. Vowels of All Substrings

Medium
MathStringDynamic ProgrammingCombinatorics

Problem Explanation

Explanation

To solve this problem, we can iterate through each character of the input string word and calculate the number of vowels in all substrings that end at that character. We can keep track of the count of vowels encountered so far and update it as we move on to the next character.

Algorithm:

  1. Initialize a variable vowelCount to keep track of the running count of vowels.
  2. Initialize a variable result to store the final sum of vowels in all substrings.
  3. Iterate through each character in the input string word.
  4. If the current character is a vowel, increment vowelCount.
  5. Add vowelCount to the result for the current character.
  6. Repeat steps 3-5 until all characters are processed.
  7. Return the result as the total sum of vowels in all substrings.

Time Complexity: O(n) where n is the length of the input string word. Space Complexity: O(1)

Solution Code

class Solution {
    public int vowelsInSubstrings(String word) {
        int result = 0;
        int vowelCount = 0;
        
        for (char ch : word.toCharArray()) {
            if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u') {
                vowelCount++;
            }
            result += vowelCount;
        }
        
        return result;
    }
}

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