LeetCode 1255. Maximum Score Words Formed by Letters
时间:2019-11-10
本文章向大家介绍LeetCode 1255. Maximum Score Words Formed by Letters,主要包括LeetCode 1255. Maximum Score Words Formed by Letters使用实例、应用技巧、基本知识点总结和需要注意事项,具有一定的参考价值,需要的朋友可以参考一下。
1、原题目描述:
Given a list of words
, list of single letters
(might be repeating) and score
of every character.
Return the maximum score of any valid set of words formed by using the given letters (words[i]
cannot be used two or more times).
It is not necessary to use all characters in letters
and each letter can only be used once. Score of letters 'a'
, 'b'
, 'c'
, ... ,'z'
is given by score[0]
, score[1]
, ... , score[25]
respectively.
Example 1:
Input: words = ["dog","cat","dad","good"], letters = ["a","a","c","d","d","d","g","o","o"], score = [1,0,9,5,0,0,3,0,0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0] Output: 23 Explanation: Score a=1, c=9, d=5, g=3, o=2 Given letters, we can form the words "dad" (5+1+5) and "good" (3+2+2+5) with a score of 23. Words "dad" and "dog" only get a score of 21.
Example 2:
Input: words = ["xxxz","ax","bx","cx"], letters = ["z","a","b","c","x","x","x"], score = [4,4,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,5,0,10] Output: 27 Explanation: Score a=4, b=4, c=4, x=5, z=10 Given letters, we can form the words "ax" (4+5), "bx" (4+5) and "cx" (4+5) with a score of 27. Word "xxxz" only get a score of 25.
Example 3:
Input: words = ["leetcode"], letters = ["l","e","t","c","o","d"], score = [0,0,1,1,1,0,0,0,0,0,0,1,0,0,1,0,0,0,0,1,0,0,0,0,0,0] Output: 0 Explanation: Letter "e" can only be used once.
Constraints:
1 <= words.length <= 14
1 <= words[i].length <= 15
1 <= letters.length <= 100
letters[i].length == 1
score.length == 26
0 <= score[i] <= 10
words[i]
,letters[i]
contains only lower case English letters.
2、简要翻译:
输入:字符串列表 words ,字符列表letters(给出允许出现的字符和个数的限制),分数列表 score (长度为26,代表每个字符的得分)
输出:用letters 中的字符拼接words 中的字符串,给出最大得分。
3、代码思路:
用回溯法遍历各种可能性,时间复杂度 O(2^n),可以使用一些剪枝的技巧。
4、JAVA代码实现:
private static int result; private static Map<String, Integer> scoreMap = null; private static int[] lettersNumber; public int maxScoreWords(String[] words, char[] letters, int[] score) { result = 0; scoreMap = new HashMap<>(); lettersNumber = new int[26]; char[] chars; int wordScore; for (String word : words) { chars = word.toCharArray(); wordScore = 0; for (char aChar : chars) { wordScore += score[aChar - 'a']; } scoreMap.put(word, wordScore); } for (char letter : letters) { lettersNumber[letter - 'a']++; } Arrays.sort(words, (a, b) -> scoreMap.get(b) - scoreMap.get(a)); dfsHelper(0, 0, words); return result; } private void dfsHelper(int score, int index, String[] words) { if (index >= words.length) { result = Math.max(result, score); return; } String word = words[index]; if ((score + scoreMap.get(word) * (words.length - index)) <= result) { return; } char[] chars = word.toCharArray(); int len = 0; for (char aChar : chars) { if (lettersNumber[aChar - 'a'] > 0) { lettersNumber[aChar - 'a']--; len++; } else { break; } } if (len == chars.length) { score += scoreMap.get(word); dfsHelper(score, index + 1, words); score -= scoreMap.get(word); } for (int i = 0; i < len; i++) { lettersNumber[chars[i] - 'a']++; } dfsHelper(score, index + 1, words); }
原文地址:https://www.cnblogs.com/onePunchCoder/p/11830504.html
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