Jan 10

Author: siddydutta

2025-01-January-LeetCoding-Challenge/README.md

@@ -12,7 +12,7 @@
 | January 7  | [1408. String Matching in an Array](https://leetcode.com/problems/string-matching-in-an-array/) | Easy | Solved |
 | January 8  | [3042. Count Prefix and Suffix Pairs I](https://leetcode.com/problems/count-prefix-and-suffix-pairs-i/) | Easy | Solved |
 | January 9  | [2185. Counting Words With a Given Prefix](https://leetcode.com/problems/counting-words-with-a-given-prefix/) | Easy | Solved |
-| January 10 | []() |  |  |
+| January 10 | [916. Word Subsets](https://leetcode.com/problems/word-subsets/) | Medium | Solved |
 | January 11 | []() |  |  |
 | January 12 | []() |  |  |
 | January 13 | []() |  |  |
@@ -40,5 +40,5 @@
 | Level  | Problems | Solved | Unsolved |
 | ---    | --- | --- | --- |
 | Easy   | 4 | 4 | 0 |
-| Medium | 5 | 5 | 0 |
+| Medium | 6 | 6 | 0 |
 | Hard   | 0 | 0 | 0 |

2025-01-January-LeetCoding-Challenge/Word Subsets.py

@@ -0,0 +1,35 @@
+from collections import Counter, defaultdict
+from typing import List
+
+
+class Solution:
+    def wordSubsets(self, words1: List[str], words2: List[str]) -> List[str]:
+        req_freq = defaultdict(int)
+        for word in words2:
+            for ch, count in Counter(word).items():
+                req_freq[ch] = max(req_freq[ch], count)
+
+        result = []
+        for word in words1:
+            freq = Counter(word)
+            for ch, count in req_freq.items():
+                if freq[ch] < count:
+                    break
+            else:
+                # for ... else instead of using a flag
+                result.append(word)
+        return result
+
+
+def main():
+    words1 = ['amazon', 'apple', 'facebook', 'google', 'leetcode']
+    words2 = ['e', 'o']
+    assert Solution().wordSubsets(words1, words2) == ['facebook', 'google', 'leetcode']
+
+    words1 = ['amazon', 'apple', 'facebook', 'google', 'leetcode']
+    words2 = ['l', 'e']
+    assert Solution().wordSubsets(words1, words2) == ['apple', 'google', 'leetcode']
+
+
+if __name__ == '__main__':
+    main()