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LeetCode 748 最短补全词

2021-12-11 15:02:29  阅读:178  来源: 互联网

标签:licensePlate 补全 748 ShortestCompletingWord words ansStr LeetCode String


给你一个字符串 licensePlate 和一个字符串数组 words ,请你找出并返回 words 中的 最短补全词

补全词 是一个包含 licensePlate 中所有的字母的单词。在所有补全词中,最短的那个就是 最短补全词

在匹配 licensePlate 中的字母时:

  • 忽略 licensePlate 中的 数字和空格
  • 不区分大小写
  • 如果某个字母在 licensePlate 中出现不止一次,那么该字母在补全词中的出现次数应当一致或者更多。

例如:licensePlate = "aBc 12c",那么它的补全词应当包含字母 'a''b' (忽略大写)和两个 'c' 。可能的 补全词"abccdef""caaacab" 以及 "cbca"

请你找出并返回 words 中的 最短补全词 。题目数据保证一定存在一个最短补全词。当有多个单词都符合最短补全词的匹配条件时取 words最靠前的 那个。

 

示例 1:

输入:licensePlate = "1s3 PSt", words = ["step", "steps", "stripe", "stepple"]
输出:"steps"
解释:最短补全词应该包括 "s"、"p"、"s"(忽略大小写) 以及 "t"。
"step" 包含 "t"、"p",但只包含一个 "s",所以它不符合条件。
"steps" 包含 "t"、"p" 和两个 "s"。
"stripe" 缺一个 "s"。
"stepple" 缺一个 "s"。
因此,"steps" 是唯一一个包含所有字母的单词,也是本例的答案。

示例 2:

输入:licensePlate = "1s3 456", words = ["looks", "pest", "stew", "show"]
输出:"pest"
解释:licensePlate 只包含字母 "s" 。所有的单词都包含字母 "s" ,其中 "pest"、"stew"、和 "show" 三者最短。答案是 "pest" ,因为它是三个单词中在 words 里最靠前的那个。

示例 3:

输入:licensePlate = "Ah71752", words = ["suggest","letter","of","husband","easy","education","drug","prevent","writer","old"]
输出:"husband"

示例 4:

输入:licensePlate = "OgEu755", words = ["enough","these","play","wide","wonder","box","arrive","money","tax","thus"]
输出:"enough"

示例 5:

输入:licensePlate = "iMSlpe4", words = ["claim","consumer","student","camera","public","never","wonder","simple","thought","use"]
输出:"simple"

 

提示:

  • 1 <= licensePlate.length <= 7
  • licensePlate 由数字、大小写字母或空格 ' ' 组成
  • 1 <= words.length <= 1000
  • 1 <= words[i].length <= 15
  • words[i] 由小写英文字母组成
Related Topics
  • 数组
  • 哈希表
  • 字符串
  • 哈希
    /**
     * 哈希
     * @param licensePlate
     * @param words
     * @return
     */
    public static String shortestCompletingWord(String licensePlate, String[] words) {
        if (licensePlate == null || words == null || words.length == 0) return "";
    
        int[] chNums = new int[26];
        for (char c : licensePlate.toCharArray()) {
            if (c >= 'A' && c <= 'Z') c += ('a' - 'A');
            if (c >= 'a' && c <= 'z') {
                chNums[c - 'a']++;
            }
        }
    
        int idx = -1, len = Integer.MAX_VALUE;
        for (int i = 0; i < words.length; i++) {
            boolean flag = true;
            int[] chTmpNums = new int[26];
            for (char c : words[i].toCharArray()) {
                if (c >= 'A' && c <= 'Z') c += ('a' - 'A');
    
                if ((c >= 'a' && c <= 'z')) {
                    chTmpNums[c - 'a']++;
                }
            }
            for (int j = 0; j < 26; j++) {
                if (chTmpNums[j] < chNums[j]) {
                    flag = false;
                    break;
                }
            }
    
            if (flag && len > words[i].length()) {
                idx = i;
                len = words[i].length();
            }
        }
        return idx == -1 ? "" : words[idx];
    }
    
    
    测试用例
    public static void main(String[] args) {
        String licensePlate = "1s3 PSt";
        String[] words = new String[]{"step", "steps", "stripe", "stepple"};
        String ansStr = ShortestCompletingWord.shortestCompletingWord(licensePlate, words);
        System.out.println("ShortestCompletingWord demo01 result : " + ansStr);
    
        licensePlate = "1s3 456";
        words = new String[]{"looks", "pest", "stew", "show"};
        ansStr = ShortestCompletingWord.shortestCompletingWord(licensePlate, words);
        System.out.println("ShortestCompletingWord demo02 result : " + ansStr);
    
        licensePlate = "Ah71752";
        words = new String[]{"suggest", "letter", "of", "husband", "easy", "education", "drug", "prevent", "writer", "old"};
        ansStr = ShortestCompletingWord.shortestCompletingWord(licensePlate, words);
        System.out.println("ShortestCompletingWord demo03 result : " + ansStr);
    
        licensePlate = "OgEu755";
        words = new String[]{"enough", "these", "play", "wide", "wonder", "box", "arrive", "money", "tax", "thus"};
        ansStr = ShortestCompletingWord.shortestCompletingWord(licensePlate, words);
        System.out.println("ShortestCompletingWord demo04 result : " + ansStr);
    
        licensePlate = "iMSlpe4";
        words = new String[]{"claim", "consumer", "student", "camera", "public", "never", "wonder", "simple", "thought", "use"};
        ansStr = ShortestCompletingWord.shortestCompletingWord(licensePlate, words);
        System.out.println("ShortestCompletingWord demo05 result : " + ansStr);
    }
    
    测试结果
    ShortestCompletingWord demo01 result : steps
    ShortestCompletingWord demo02 result : pest
    ShortestCompletingWord demo03 result : husband
    ShortestCompletingWord demo04 result : enough
    ShortestCompletingWord demo05 result : simple
    

    标签:licensePlate,补全,748,ShortestCompletingWord,words,ansStr,LeetCode,String
    来源: https://www.cnblogs.com/fyusac/p/15675605.html

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