383. Ransom Note - https://leetcode.com/problems/ransom-note/

canConstruct1.java

class Solution {
    public boolean canConstruct(String ransomNote, String magazine) {

        int[] charCount = new int[26];

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

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

            charCount[c - 'a']--;
        }

        return true;
    }
}