Given an arbitrary ransom note string and another string containing letters from all the magazines, write a function that will return true if the ransom note can be constructed from the magazines ; otherwise, it will return false.

Each letter in the magazine string can only be used once in your ransom note.

Note:

假设只包含小写字母

canConstruct("a", "b") -> false
canConstruct("aa", "ab") -> false
canConstruct("aa", "aab") -> true

思路

判断ransomNote中的字符在magezine出现的次数，如果ransomNote中字符出现的次数多余在magezine中出现的此处，那么返回False。

Python

class Solution(object):
    def canConstruct(self, ransomNote, magazine):
        """
        :type ransomNote: str
        :type magazine: str
        :rtype: bool
        """
        if len(ransomNote) == 0:
            return True
        for each in list(set(ransomNote)):
            if ransomNote.count(each) > magazine.count(each):
                return False
        return True