[LeetCode] 524. Longest Word in Dictionary through Deleting

Posted C·Moriarty

tags:

篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了[LeetCode] 524. Longest Word in Dictionary through Deleting相关的知识,希望对你有一定的参考价值。

Given a string and a string dictionary, find the longest string in the dictionary that can be formed by deleting some characters of the given string. If there are more than one possible results, return the longest word with the smallest lexicographical order. If there is no possible result, return the empty string.

Example 1:

Input:
s = "abpcplea", d = ["ale","apple","monkey","plea"]

Output: 
"apple"

 

 

Example 2:

Input:
s = "abpcplea", d = ["a","b","c"]

Output: 
"a"

 

Note:

  1. All the strings in the input will only contain lower-case letters.
  2. The size of the dictionary won‘t exceed 1,000.
  3. The length of all the strings in the input won‘t exceed 1,000.

题意:找出d中的最长的s的子串

从d中一个一个判断就行了。。(其实可以维护一个长度标记,小于这个长度就不判断了,可以优化一些。由于当时写的着急,这里就不写了)

class Solution {
    public String findLongestWord(String s, List<String> d) {
        TreeSet<String> set = new TreeSet<String>((s1, s2)-> {
            if (s1.length() < s2.length())
                return 1;
            if (s1.length() > s2.length())
                return -1;
            if (s1.compareTo(s2) > 0)
                return 1;
            if (s1.compareTo(s2) < 0)
                return -1;
            return 0;
        });
        for (String str : d) {
            if (isVal(s, str))
                set.add(str);
        }
        if (set.size() == 0)
            return "";
        return set.first();
    }
    public boolean isVal(String superStr, String subStr) {
        int i = 0;
        int j = 0;
        while (i < superStr.length()) {
            if (superStr.charAt(i) == subStr.charAt(j)) {
                i ++;
                j ++;
                if (j == subStr.length())
                    return true;
            }
            else 
                i ++;
        }
        return false;
    }
}

 

以上是关于[LeetCode] 524. Longest Word in Dictionary through Deleting的主要内容,如果未能解决你的问题,请参考以下文章

LeetCode 524. Longest Word in Dictionary through Deleting (通过删除字母匹配到字典里最长单词)

524. Longest Word in Dictionary through Deleting

524 Longest Word in Dictionary through Deleting

524. Longest Word in Dictionary through Deleting

leetcode524

leetcode中等524通过删除字母匹配到字典里最长单词