Software Engineer

You have been given a singly Linked List of 'N' nodes with integer data and an integer 'K'.

Your task is to remove the 'K'th node from the end of the given Linked List and return the head of the modified linked list.

Example:

Input : 1 -> 2 -> 3 -> 4 -> 'NULL'  and  'K' = 2
Output: 1 -> 2 -> 4 -> 'NULL'
Explanation:
After removing the second node from the end, the linked list become 1 -> 2 -> 4 -> 'NULL'.

You are given two Strings 'P' and 'Q' of equal length.

Your task is to return 1 if String 'P' can be converted into String 'Q' by cyclically rotating it to the right any number of times ( Possibly Zero ), else return 0.

A cyclic rotation to the right on String 'A' consists of taking String 'A' and moving the rightmost character to the leftmost position. For example, if 'A' = "pqrst", then it will be "tpqrs" after one cyclic rotation on 'A'.

For example:

Consider the two strings 'P' = "abfyg" and 'Q' = "gabfy" 

If we cyclically rotate String 'P' to the right once. The resulting string P becomes "gabfy" which is equal to String 'Q'. 

Therefore it is possible to convert String 'P' to String 'Q'.

Given a string "pattern", which contains only two types of characters ‘(’, ‘)’.

Your task is to find the minimum number of parentheses either ‘(’, ‘)’ we must add the parentheses in string ‘pattern’ and the resulted string is valid.

Condition for valid string-

Every opening parenthesis ‘(’ must have a correct closing parenthesis ‘)’.

Example - ‘(()(()))’, ‘()()()’, ‘((()))’ are valid string, and ‘(((’, ‘(()’, ‘)(())’ are invalid string.

Note:

1. You are not required to print the output explicitly, it has already been taken care of. Just implement the function and return the minimum number of parentheses required to make a string valid.

You are given a Singly Linked List of integers and a reference to the node to be deleted. Every node of the Linked List has a unique value written on it. Your task is to delete that node from the linked list.

A singly linked list is a linear data structure in which we can traverse only in one direction i.e. from Head to Tail. It consists of several nodes where each node contains some data and a reference to the next node.

Note:

• The reference to the head of the linked list is not given.
• The node to be deleted is not a tail node.
• The value of each node in the Linked List is unique.
• It is guaranteed that the node to be deleted is present in the linked list.

A sample Linked List-

Given an integer ‘N’ representing the number of pairs of parentheses, Find all the possible combinations of balanced parentheses with the given number of pairs of parentheses.

Note :

Conditions for valid parentheses:
1. All open brackets must be closed by the closing brackets.

2. Open brackets must be closed in the correct order.

For Example :

()()()() is a valid parentheses.
)()()( is not a valid parentheses.

You are given the arrival and departure times of N trains at a railway station in a day. You need to find the minimum of platforms required for the railway station such that no train waits i.e No train should wait for the platform to be clear or free.

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