Group Anagrams
Group strings that are anagrams of each other Return the groups in any order Example: ["eat","tea","tan","ate","nat","bat"] => [["bat"],["nat","tan"],["ate","eat","tea"]]
Group Anagrams is a classic scan-and-record problem: the right bookkeeping beats brute force. Interviewers love it because it reveals your data-structure instincts and your edge-case discipline. Watch your edge cases around repeats, and be clear about what your map is storing.
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