383.Ransom Note

題目敘述:

Given two strings ransomNote and magazine, return true if ransomNote can be constructed by using the letters from magazine and false otherwise.
Each letter in magazine can only be used once in ransomNote.

Example 1:
Input: ransomNote = "a", magazine = "b"
Output: false

Example 2:
Input: ransomNote = "aa", magazine = "ab"
Output: false

Example 3:
Input: ransomNote = "aa", magazine = "aab"
Output: true

程式碼(Python):

class Solution(object):
    def canConstruct(self, ransomNote, magazine):
        st1, st2 = Counter(ransomNote), Counter(magazine)
        if st1 & st2 == st1:
            return True
        return False