LeetCode 383 - 赎金信

class Solution:
    def canConstruct(self, ransomNote: str, magazine: str) -> bool:
        for ch in ransomNote:
            # 把字符串放入集合中，每次循环过程更新set
            charSet = set(magazine)
            if ch in charSet:
                # 如果存在，则替换为空字符，即删除该字符，1为仅删除第一个
                magazine = magazine.replace(ch, "", 1)
            if ch not in charSet:
                return False
        return True