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1704. Determine if String Halves Are Alike

Difficulty Topics

Description

You are given a string s of even length. Split this string into two halves of equal lengths, and let a be the first half and b be the second half.

Two strings are alike if they have the same number of vowels ('a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U'). Notice that s contains uppercase and lowercase letters.

Return true if a and b are alike. Otherwise, return false.

 

Example 1:

Input: s = "book"
Output: true
Explanation: a = "bo" and b = "ok". a has 1 vowel and b has 1 vowel. Therefore, they are alike.

Example 2:

Input: s = "textbook"
Output: false
Explanation: a = "text" and b = "book". a has 1 vowel whereas b has 2. Therefore, they are not alike.
Notice that the vowel o is counted twice.

 

Constraints:

  • 2 <= s.length <= 1000
  • s.length is even.
  • s consists of uppercase and lowercase letters.

Solution

determine-if-string-halves-are-alike.py
class Solution:
    def halvesAreAlike(self, s: str) -> bool:
        N = len(s)
        first = second = 0
        vowels = set(['a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U'])

        for i in range(N):
            if s[i] in vowels:
                if i < N // 2:
                    first += 1
                else:
                    second += 1

        return first == second