383 Ransom Note.py

"""
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:
You may assume that both strings contain only lowercase letters.

canConstruct("a", "b") -> false
canConstruct("aa", "ab") -> false
canConstruct("aa", "aab") -> true
Author: Rajeev Ranjan

"""

from collections import defaultdict

class Solution(object):
    def canConstruct(self, ransomNote, magazine):
        """
        :type ransomNote: str
        :type magazine: str
        :rtype: bool
        """
        d = defaultdict(int)

        for e in magazine:
            d[e] += 1

        for e in ransomNote:
            if d[e] == 0:
                return False
            d[e] -= 1

        return True