Given an array of strings, group anagrams together.
For example, given: ["eat", "tea", "tan", "ate", "nat", "bat"],
Return:
[
["ate", "eat","tea"],
["nat","tan"],
["bat"]
]
Note: All inputs will be in lower-case.
class Solution {
func groupAnagrams(_ strs: [String]) -> [[String]] {
var res = [String: [String]]()
for str in strs {
let k = str.characters.sorted().map({ "\($0)"}).reduce("", +)
var temp = res[k] ?? [String]()
temp.append(str)
res[k] = temp
}
return Array(res.values)
}
}