2022-05-29 Daily-Challenge

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In: DailyChallenge

Today I have done leetcode's May LeetCoding Challenge with cpp.

May LeetCoding Challenge 29

Description

Maximum Product of Word Lengths

​Given a string array words, return the maximum value of length(word[i]) * length(word[j]) where the two words do not share common letters. If no such two words exist, return 0.

Example 1:

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

Example 2:

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

Example 3:

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

Constraints:

  • 2 <= words.length <= 1000
  • 1 <= words[i].length <= 1000
  • words[i] consists only of lowercase English letters.

Solution

class Solution {
public:
  int maxProduct(vector<string>& words) {
    int sz = words.size();
    vector<int> mask(sz);
    vector<int> len(sz);
    for(int i = 0; i < sz; ++i) {
      for(auto c : words[i]) mask[i] |= (1 << (c - 'a'));
      len[i] = words[i].length();
    }
    int answer = 0;
    for(int i = 0; i < sz - 1; ++i) {
      for(int j = i + 1; j < sz; ++j) {
        if(!(mask[i] & mask[j])) answer = max(answer, len[i] * len[j]);
      }
    }
    return answer;
  }
};

// Accepted
// 167/167 cases passed (62 ms)
// Your runtime beats 67.22 % of cpp submissions
// Your memory usage beats 59.25 % of cpp submissions (15.8 MB)
Algorithm