Given an array of strings, return all groups of strings that are anagrams. Represent a group by a list of integers representing the index in the original list. Look at the sample case for clarification.
Anagram : a word, phrase, or name formed by rearranging the letters of another, such as
'spar', formed from
Note: All inputs will be in lower-case.
Input : cat dog god tca Output : [[1, 4], [2, 3]]
tca are anagrams which correspond to index
god are another set of anagrams which correspond to index
The indices are 1 based ( the first element has index 1 instead of index 0).
Ordering of the result : You should not change the relative ordering of the words / phrases within the group. Within a group containing
i < j.