383. Ransom Note

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.

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

Constraints:

• You may assume that both strings contain only lowercase letters.

# @lc code=start
using LeetCode
using DataStructures

function can_construct(ransom_note::String, magazine::String)::Bool
    words = DefaultDict{Char,Int}(0)
    for i in magazine
        words[i] += 1
    end
    for i in ransom_note
        words[i] == 0 && return false
        words[i] -= 1
    end
    return true
end
# @lc code=end

can_construct (generic function with 1 method)

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