本文共 1468 字，大约阅读时间需要 4 分钟。

?????????????????????????????????????????????????????????????????????????????????????????????????????????

????

????

public class Solution {
    public int countCharacters(String[] words, String chars) {
        if (words.length == 0 || chars.length() == 0) {
            return 0;
        }
        int[] arr = new int[26];
        for (int i = 0; i < chars.length(); i++) {
            char c = chars.charAt(i);
            arr[c - 'a']++;
        }
        int count = 0;
        for (int i = 0; i < words.length; i++) {
            String word = words[i];
            int[] temp = new int[26];
            boolean canForm = true;
            for (int j = 0; j < word.length(); j++) {
                char c = word.charAt(j);
                int index = c - 'a';
                if (temp[index] >= arr[index]) {
                    canForm = false;
                    break;
                }
                temp[index]++;
            }
            if (canForm) {
                count += word.length();
            }
        }
        return count;
    }
}

????

?????????????????????????????????????