解题思路：

贪心

class Solution {public String crackPassword(int[] password) {String[] strs = new String[password.length];for(int i = 0; i < password.length; i++)strs[i] = String.valueOf(password[i]);Arrays.sort(strs, (x, y) -> (x + y).compareTo(y + x));StringBuilder res = new StringBuilder();for(String s : strs)res.append(s);return res.toString();}
}