Python 算法：计算重复背诵单词后记忆的单词数量

def count_words(words): count = 0 remembered = set()

for word in words:
    if word not in remembered:
        remembered.add(word)
        count += 1

return count

words = ['you', 'thank', 'thank'] print(count_words(words)) # 输出：2