Software Engineer

You have been given a string STR and a non-empty string PTR. Your task is to find all the starting indices of PTR’s anagram in STR.

An anagram of a string is another string which contains the same characters and is obtained by rearranging the characters.

For example: ‘SILENT’ and ‘LISTEN’ are anagrams of each other. ‘ABA’ and ‘ABB’ are not anagram because we can’t convert ‘ABA’ to ‘ABB’ by rearranging the characters of particular strings.

Note:

1. Both STR and PTR consist of English uppercase letters.
2. Length of string 'STR' will always be greater than or equal to the length of string ‘PTR’.
3. In case, there is no anagram substring, then return an empty sequence.
4. In case of more than one anagrams, return the indices in increasing order.

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