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49. Group Anagrams
Medium
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 <= 1040 <= strs[i].length <= 100strs[i]consists of lowercase English letters.
Solution
# @param {String[]} strs
# @return {String[][]}
def group_anagrams(strs)
hm = Hash.new {|hash, key| hash[key] = []}
strs.each do |s|
sorted_str = s.chars.sort.join
hm[sorted_str] << s
end
hm.values
end