Given an array of strings strs, group the anagrams together. You can return the answer in any order. Two strings are anagrams if one is a rearrangement of the other's characters.

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Pythontime O(n·k log k) · space O(n·k)

def groupAnagrams(strs: list[str]) -> list[list[str]]:
    from collections import defaultdict
    groups = defaultdict(list)
    for s in strs:
        groups[tuple(sorted(s))].append(s)
    return list(groups.values())

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