49. Group Anagrams

Given an array of strings strs, group the anagrams together. You can return the answer in any order.

An Anagram is a word or phrase formed by rearranging the letters of a different word or phrase, typically using all the original letters exactly once.

Example 1:

Input: strs = ["eat","tea","tan","ate","nat","bat"]
Output: [["bat"],["nat","tan"],["ate","eat","tea"]]

Example 2:

Input: strs = [""]
Output: [[""]]

Example 3:

Input: strs = ["a"]
Output: [["a"]]

Constraints:

• 1 <= strs.length <= 104
• 0 <= strs[i].length <= 100
• strs[i] consists of lower-case English letters.

# @lc code=start
using LeetCode
using DataStructures

function group_anagrams(strs::Vector{String})::Vector{Vector{String}}
    swords = DefaultDict{AbstractString,Vector{String}}(Vector{Int})
    for word in strs
        key = join(sort(collect(word)))
        push!(swords[key], word)
    end
    res = Vector{Vector{String}}()
    for (k, v) in swords
        push!(res, v)
    end
    return res
end
# @lc code=end

group_anagrams (generic function with 1 method)

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