Leetcode Problem 1220. Count Vowels Permutation

1220. Count Vowels Permutation

Leetcode Solutions

Dynamic Programming (Bottom-up) with Optimized Space

  1. Initialize variables aCount, eCount, iCount, oCount, uCount to 1 since there is one string of length 1 for each vowel.
  2. For each length from 2 to n, update the counts for each vowel based on the previous counts and the rules provided.
  3. The new count for each vowel is calculated as follows:
    • aCountNew = eCount + iCount + uCount
    • eCountNew = aCount + iCount
    • iCountNew = eCount + oCount
    • oCountNew = iCount
    • uCountNew = iCount + oCount
  4. After the final iteration, sum up the counts for all vowels and return the result modulo 10^9 + 7.
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Dynamic Programming (Top-down, Recursion) with Memoization

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