318. Maximum Product of Word Lengths #

题目 #

Given a string array words, find the maximum value of length(word[i]) * length(word[j]) where the two words do not share common letters. You may assume that each word will contain only lower case letters. If no such two words exist, return 0.

Example 1:

Input: ["abcw","baz","foo","bar","xtfn","abcdef"]
Output: 16 
Explanation: The two words can be "abcw", "xtfn".

Example 2:

Input: ["a","ab","abc","d","cd","bcd","abcd"]
Output: 4 
Explanation: The two words can be "ab", "cd".

Example 3:

Input: ["a","aa","aaa","aaaa"]
Output: 0 
Explanation: No such pair of words.

题目大意 #

给定一个字符串数组 words，找到 length(word[i]) * length(word[j]) 的最大值，并且这两个单词不含有公共字母。你可以认为每个单词只包含小写字母。如果不存在这样的两个单词，返回 0。

解题思路 #

• 在字符串数组中找到 2 个没有公共字符的字符串，并且这两个字符串的长度乘积要是最大的，求这个最大的乘积。
• 这里需要利用位运算 & 运算的性质，如果 X & Y = 0，说明 X 和 Y 完全不相同。那么我们将字符串都编码成二进制数，进行 & 运算即可分出没有公共字符的字符串，最后动态维护长度乘积最大值即可。将字符串编码成二进制数的规则比较简单，每个字符相对于 ‘a’ 的距离，根据这个距离将 1 左移多少位。

    a 1->1  
    b 2->10  
    c 4->100  
    ab 3->11  
    ac 5->101  
    abc 7->111  
    az 33554433->10000000000000000000000001  

代码 #

package leetcode

func maxProduct318(words []string) int {
	if words == nil || len(words) == 0 {
		return 0
	}
	length, value, maxProduct := len(words), make([]int, len(words)), 0
	for i := 0; i < length; i++ {
		tmp := words[i]
		value[i] = 0
		for j := 0; j < len(tmp); j++ {
			value[i] |= 1 << (tmp[j] - 'a')
		}
	}
	for i := 0; i < length; i++ {
		for j := i + 1; j < length; j++ {
			if (value[i]&value[j]) == 0 && (len(words[i])*len(words[j]) > maxProduct) {
				maxProduct = len(words[i]) * len(words[j])
			}
		}
	}
	return maxProduct
}