Word Subsets LeetCode Solution - The Coding Shala

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 In this post, we will learn how to solve LeetCode's Word Subsets Problem and will implement its solution in Java.

Word Subsets Problem

We are given two arrays A and B of words.  Each word is a string of lowercase letters. Now, say that word b is a subset of the word an if every letter in b occurs in a, including multiplicity.  For example, "wrr" is a subset of "warrior", but is not a subset of "world". Now say a word a from A is universal if, for every b in B, b is a subset of a.  Return a list of all universal words in A.  You can return the words in any order.

Example 1:
Input: A = ["amazon","apple","facebook","google","leetcode"], B = ["e","o"]
Output: ["facebook","google","leetcode"]

Example 2:
Input: A = ["amazon","apple","facebook","google","leetcode"], B = ["l","e"]
Output: ["apple","google","leetcode"]

Example 3:
Input: A = ["amazon","apple","facebook","google","leetcode"], B = ["e","oo"]
Output: ["facebook","google"]

Practice this problem on LeetCode(Click Here).

Word Subsets Java Solution

Approach 1

Use the words of array B as a single word then checks with array A words. First, we count the maximum letters required to make all the words in array B. then will compare this count with array A words.

Java Program: 

class Solution {
    public List<String> wordSubsets(String[] A, String[] B) {
        List<String> ans = new ArrayList<>();
        
        int[] find = new int[26];
        for(String tmp : B) {
            int[] count = new int[26];
            for(int i=0; i<tmp.length();i++) {
                count[tmp.charAt(i)-'a']++;
            }
            for(int i=0; i<26; i++) {
                if(count[i] > find[i]) {
                    find[i] = count[i];
                }
            }
        }
        
        for(String tmp : A) {
            int[] check = new int[26];
            for(int i=0; i< tmp.length(); i++) {
                check[tmp.charAt(i)-'a']++;
            }
            
            int flag = 0;
            for(int i=0; i<26; i++){
                if(check[i] < find[i]) {
                    flag = 1;
                    break;
                }
            }
            if(flag == 0) ans.add(tmp);
        }
        return ans;
    }
}


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