383. Ransom Note

https://leetcode.com/problems/ransom-note/

Python

Mapped by 26 letter list

class Solution:
    def canConstruct(self, ransomNote: str, magazine: str) -> bool:
        used = list(magazine)

        for char in ransomNote:
            if char not in used:
                return False
            used[used.index(char)] = None

        return True

Built-in Counter

from collections import Counter


class Solution:
    def canConstruct(self, ransomNote: str, magazine: str) -> bool:
        counts = Counter(magazine)

        for letter in ransomNote:
            if letter not in counts or counts[letter]-1 < 0:
                return False
            counts[letter] -= 1

        return True