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 are given an array Arr consisting of n integers, you need to find all the distinct triplets present in the array which adds up to zero.

An array is said to have a triplet {arr[i], arr[j], arr[k]} with 0 sum if there exists three indices i, j and k such that i!=j, j!=k and i!=k and arr[i] + arr[j] + arr[k] = 0.

Note :

1. You can return the list of values in any order. For example, if a valid triplet is {1, 2, -3}, then (2, -3, 1), (-3, 2, 1) etc is also valid triplet. Also, the ordering of different triplets can be random i.e if there are more than one valid triplets, you can return them in any order.
2. The elements in the array need not be distinct.
3. If no such triplet is present in the array, then return an empty list, and the output printed for such a test case will be "-1".

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