318. 最大单词长度乘积

题目链接：318. 最大单词长度乘积 - 力扣（LeetCode）

 

 

 

 

 

 

 

 

 

 

 

解析：

位运算，将字母表示成01的值，然后&

class Solution {
public:int maxProduct(vector<string>& words) {int n = words.size();vector<int> mapp;bool vis[26];for (int i = 0; i < n; i++) {int temp = 0;memset(vis, 0, sizeof(vis));for (int j = 0; j < words[i].size(); j++) {int c = words[i][j] - 'a';if (vis[c]) continue;vis[c] = 1;temp += (1 << c);}mapp.push_back(temp);}int max_v = 0;for (int i = 0; i < n; i++) {for (int j = i + 1; j < n; j++) {if (mapp[i] & mapp[j]) continue;int v = words[i].size() * words[j].size();max_v = max(max_v, v);}}return max_v;}
};