LeetCode 1704 Determine if String Halves Are Alike (Python)

题目

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.

解题思路

将字符串分成两个部分，然后统计元音字母出现的次数，判断是否相等

代码

class Solution:
    def halvesAreAlike(self, s: str) -> bool:
        l = len(s) // 2
        ct1 = Counter(s[:l].lower())
        ct2 = Counter(s[l:].lower())
        tmp1 = tmp2 = 0
        for c in ('a', 'e', 'i', 'o', 'u'):
            tmp1 += ct1[c]
            tmp2 += ct2[c]
        return tmp1 == tmp2

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