383. Ransom Note

用int array记录可用字母数量
0的时候说明GG了

 public boolean canConstruct(String ransomNote, String magazine) {
        if(ransomNote.length() > magazine.length()) return false;
        int[] letters = new int[26];
        
        for(int n = 0; n < magazine.length();n++)
        {
            letters[magazine.charAt(n) - 'a']++;
        }
        for(int n = 0; n < ransomNote.length();n++)
        {
            if(letters[ransomNote.charAt(n) -'a'] != 0) letters[ransomNote.charAt(n)-'a']--;
            else return false;
        }
        return true;
    }