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.

You have been given a string 'S' containing only three types of characters, i.e. '(', ')' and '*'.

A Valid String is defined as follows:

1. Any left parenthesis '(' must have a corresponding right parenthesis ')'.
2. Any right parenthesis ')' must have a corresponding left parenthesis '('.
3. Left parenthesis '(' must go before the corresponding right parenthesis ')'.
4. '*' could be treated as a single right parenthesis ')' or a single left parenthesis '(' or an empty string.
5. An empty string is also valid.

Your task is to find out whether the given string is a Valid String or not.

Given a string input of length n, find the length of the longest substring without repeating characters i.e return a substring that does not have any repeating characters.

Substring is the continuous sub-part of the string formed by removing zero or more characters from both ends.

You have been given a singly Linked List in the form of 'L1' -> 'L2' -> 'L3' -> ... 'Ln'. Your task is to rearrange the nodes of this list to make it in the form of 'L1' -> 'Ln' -> 'L2' -> 'Ln-1' and so on. You are not allowed to alter the data of the nodes of the given linked list.

For example:

If the given linked list is 1 -> 2 -> 3 -> 4 -> 5 -> NULL.

Then rearrange it into 1 -> 5 -> 2 -> 4 -> 3 -> NULL. 

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