示例 1：
输入：words = ["Hello","Alaska","Dad","Peace"]输出：["Alaska","Dad"]
示例 2：
输入：words = ["omk"]输出：[]
示例 3：
输入：words = ["adsdf","sfd"]输出：["adsdf","sfd"]
来源：力扣（LeetCode）链接：https://leetcode-cn.com/problems/keyboard-row著作权归领扣网络所有。商业转载请联系官方授权，非商业转载请注明出处。

class Solution {    public String[] findWords(String[] words) {        String[] temp = new String[]{"qwertyuiop","asdfghjkl","zxcvbnm"};        int[] chars = new int[26];        int i = 1;        for (String s : temp) {            for (char c : s.toCharArray()) {                chars[c - 'a'] = i;            }            i++;        }        
        List<String> list = new ArrayList<>();
        for (String word : words) {            int j = -1;            boolean flag = true;            for (char wordChar : word.toCharArray()) {                wordChar = Character.toLowerCase(wordChar);                if (j == -1) {                    j = chars[wordChar - 'a'];                } else if (j != chars[wordChar - 'a']) {                    flag = false;                    break;                }            }            if (flag) {                list.add(word);            }        }

        String[] ans = new String[list.size()];        for (int k = 0; k < list.size(); k++) {            ans[k] = list.get(k);        }
        return ans;    }}