freecodecamp--freecodecamp/curriculum/challenges/english/blocks/daily-coding-challenges-python/69cfca90e8a0a6d4d6871c4e.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
69cfca90e8a0a6d4d6871c4e	Challenge 264: Anagram Groups	29	challenge-264

--description--

Given an array of words, return a 2d array of the words grouped into anagrams.

• Words are anagrams if they contain the same letters in any order.
• Each word belongs to exactly one group.
• Return order doesn't matter.

For example, given ["listen", "silent", "hello", "enlist", "world"], return [["listen", "silent", "enlist"], ["hello"], ["world"]].

--hints--

group_anagrams(["listen", "silent", "hello", "enlist", "world"]) should return [["listen", "silent", "enlist"], ["hello"], ["world"]].

({test: () => { runPython(`
from unittest import TestCase
groups = group_anagrams(["listen", "silent", "hello", "enlist", "world"])
sorted_groups = sorted([sorted(g) for g in groups], key=lambda g: g[0])
TestCase().assertEqual(sorted_groups, [["enlist", "listen", "silent"], ["hello"], ["world"]])`)
}})

group_anagrams(["eat", "tea", "tan", "ate", "nat", "bat"]) should return [["ate", "eat", "tea"], ["bat"], ["nat", "tan"]].

({test: () => { runPython(`
from unittest import TestCase
groups = group_anagrams(["eat", "tea", "tan", "ate", "nat", "bat"])
sorted_groups = sorted([sorted(g) for g in groups], key=lambda g: g[0])
TestCase().assertEqual(sorted_groups, [["ate", "eat", "tea"], ["bat"], ["nat", "tan"]])`)
}})

group_anagrams(["care", "race", "acre", "pots", "stop", "tops", "opts", "post", "spot", "evil", "vile", "live", "veil"]) should return [["acre", "care", "race"], ["evil", "live", "veil", "vile"], ["opts", "post", "pots", "spot", "stop", "tops"]].

({test: () => { runPython(`
from unittest import TestCase
groups = group_anagrams(["care", "race", "acre", "pots", "stop", "tops", "opts", "post", "spot", "evil", "vile", "live", "veil"])
sorted_groups = sorted([sorted(g) for g in groups], key=lambda g: g[0])
TestCase().assertEqual(sorted_groups, [["acre", "care", "race"], ["evil", "live", "veil", "vile"], ["opts", "post", "pots", "spot", "stop", "tops"]])`)
}})

group_anagrams(["algorithms", "logarithms", "education", "cautioned", "auctioned", "triangle", "integral", "alerting", "relating"]) should return [["alerting", "integral", "relating", "triangle"], ["algorithms", "logarithms"], ["auctioned", "cautioned", "education"]].

({test: () => { runPython(`
from unittest import TestCase
groups = group_anagrams(["algorithms", "logarithms", "education", "cautioned", "auctioned", "triangle", "integral", "alerting", "relating"])
sorted_groups = sorted([sorted(g) for g in groups], key=lambda g: g[0])
TestCase().assertEqual(sorted_groups, [["alerting", "integral", "relating", "triangle"], ["algorithms", "logarithms"], ["auctioned", "cautioned", "education"]])`)
}})

--seed--

--seed-contents--

def group_anagrams(words):

    return words

--solutions--

def group_anagrams(words):
    groups = {}
    for word in words:
        key = ''.join(sorted(word))
        if key not in groups:
            groups[key] = []
        groups[key].append(word)
    return list(groups.values())