Ransom Note

public boolean canConstruct(String ransomNote, String magazine) {
    if (ransomNote.length() > magazine.length()) return false;

    int[] count = new int[26];

    for (char c : magazine.toCharArray()) {
        count[c - 'a']++;
    }

    for (char c : ransomNote.toCharArray()) {
        if (--count[c - 'a'] < 0) {
            return false;
        }
    }

    return true;
}