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1704. Determine if String Halves Are Alike
給你一個字串，問你他的前後兩半是否相似。
相似的定義為擁有同樣數量的母音(包含aeiouAEIOU)。
Example 1:
Input: s = "book"
Output: true
Explanation: a = "bo" and b = "ok". a has 1 vowel and b has 1 vowel.
Example 2:
Input: s = "textbook"
Output: false
Explanation: a = "text" and b = "book". a has 1 vowel whereas b has 2.
思路:
1.切一半，Counter()，把母音數量的差距加起來看是不是0，沒了
class Solution:
def halvesAreAlike(self, s: str) -> bool:
n = len(s)
a = Counter(s[:n//2])
b = Counter(s[n//2:])
return sum([a[c] - b[c] for c in 'aeiouAEIOU']) == 0
又是開心水題的一天
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