Leetcode Problem 2559. Count Vowel Strings in Ranges

2559. Count Vowel Strings in Ranges

Leetcode Solutions

Prefix Sum Approach

  1. Initialize an array prefix of size n+1 where n is the length of words, with all elements set to 0.
  2. Iterate over the words array, and for each word, check if it starts and ends with a vowel.
  3. If it does, increment the value at the current index in the prefix array.
  4. After checking each word, update the prefix array to contain the cumulative sum up to the current index.
  5. Initialize an empty list ans to store the results of the queries.
  6. Iterate over the queries array, and for each query [li, ri], calculate the number of words starting and ending with a vowel in the range by subtracting prefix[li] from prefix[ri + 1].
  7. Append the result to the ans list.
  8. Return the ans list.
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Brute Force Approach

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