916. Word Subsets
We are given two arrays
A
andB
of words. Each word is a string of lowercase letters.Now, say that word
b
is a subset of worda
if every letter inb
occurs ina
, including multiplicity. For example,"wrr"
is a subset of"warrior"
, but is not a subset of"world"
.Now say a word
a
fromA
is universal if for everyb
inB
,b
is a subset ofa
.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"]
Example 4:
Input: A = ["amazon","apple","facebook","google","leetcode"], B = ["lo","eo"] Output: ["google","leetcode"]
Example 5:
Input: A = ["amazon","apple","facebook","google","leetcode"], B = ["ec","oc","ceo"] Output: ["facebook","leetcode"]
Note:
1 <= A.length, B.length <= 10000
1 <= A[i].length, B[i].length <= 10
A[i]
andB[i]
consist only of lowercase letters.- All words in
A[i]
are unique: there isn'ti != j
withA[i] == A[j]
.
Approach #1: String. [Java]
class Solution { public List<String> wordSubsets(String[] A, String[] B) { int[] init = new int[26], temp; for (String b : B) { temp = counter(b); for (int i = 0; i < 26; ++i) { init[i] = Math.max(init[i], temp[i]); } } List<String> ret = new ArrayList<>(); for (String a : A) { temp = counter(a); int i = 0; for (i = 0; i < 26; ++i) { if (temp[i] < init[i]) break; } if (i == 26) ret.add(a); } return ret; } public int[] counter(String b) { int[] temp = new int[26]; for (int i = 0; i < b.length(); ++i) { temp[b.charAt(i)-'a']++; } return temp; } }
Reference:
https://leetcode.com/problems/word-subsets/discuss/175854/C%2B%2BJavaPython-Straight-Forward
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