524. Longest Word in Dictionary through Deleting

https://leetcode.com/problems/longest-word-in-dictionary-through-deleting/#/solutions

An alternate, more efficient solution which avoids sorting the dictionary:

public String findLongestWord(String s, List<String> d) {
    String longest = "";   // 用来比较的local
    for (String dictWord : d) {  // 题意: 顺序遍历
        int i = 0;               // 每次都得从target头部开始遍历
        for (char c : s.toCharArray())   // 判断字符串的每一个字母相等用toCharArray
            if (i < dictWord.length() && c == dictWord.charAt(i)) i++; 题意: 比较

        if (i == dictWord.length() && dictWord.length() >= longest.length()) //判断是否满足题意
            if (dictWord.length() > longest.length() || dictWord.compareTo(longest) < 0) // 是否满足两点, 更新global, 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　学会s.compareTo(ss) 来比较字典顺序

　　　　　　　　 longest = dictWord;　　} 　　return longest; } 

Time Complexity: O(nk), where n is the length of string s and k is the number of words in the dictionary.