Group Anagrams Problem Overview

Overview

This lecture covers the "Group Anagrams" problem from LeetCode, explaining the task, examples, and relevant constraints.

Problem Statement

• Given an array of strings strs, group all anagrams together.
• The answer can be returned in any order.

Examples

• Input: ["eat","tea","tan","ate","nat","bat"]
  • Output: [["bat"],["nat","tan"],["ate","eat","tea"]]
  • "nat" and "tan" are anagrams; "ate", "eat", "tea" are anagrams.
• Input: [""]
  • Output: [[""]]
• Input: ["a"]
  • Output: [["a"]]

Constraints

• 1 <= strs.length <= 10,000
• 0 <= strs[i].length <= 100
• Each string consists of lowercase English letters.

Related Topics

• Arrays: Working with lists or collections of data.
• Hash Tables: Efficient lookup and grouping based on keys.
• Strings: Manipulation and comparison of sequences of characters.
• Sorting: Rearranging items in a particular order, often used to check for anagrams.

Key Terms & Definitions

• Anagram — Words or phrases made by rearranging the letters of another word or phrase.
• Hash Table — A data structure allowing fast association of keys and values.

Action Items / Next Steps

• Review the Group Anagrams problem and try to implement a solution using hash tables.
• Practice solving similar problems, such as "Valid Anagram."