SDE - 1

You are given a 9x9 sudoku. Your task is to solve sudoku and return the solution.

A sudoku is a puzzle in which players insert the numbers one to nine into a grid consisting of nine squares subdivided into a further nine smaller squares in such a way that every number appears once in each horizontal line, vertical line, and square.

For example: Consider following sudoku:

To solve it you have to fill blank spaces by numbers from 1 to 9 subject to constraints:

Any number should not occur more than once per row.

Any number should not occur more than once per column.

Any number should not occur more than once per block of 3x3(here, each block is distinguished by bold borders).

It will be solved as:

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'.

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