Problem
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") -> falsecanConstruct("aa", "ab") -> falsecanConstruct("aa", "aab") -> true Solution
class Solution { public boolean canConstruct(String ransomNote, String magazine) { int[] note = new int[26]; for (char ch: magazine.toCharArray()) { note[ch-'a']++; } for (char ch: ransomNote.toCharArray()) { if (--note[ch-'a'] < 0) return false; } return true; }}