Software Engineer

You are given an array of integers 'ARR' of length 'N' and an integer Target. Your task is to return all pairs of elements such that they add up to Target.

Note:

We cannot use the element at a given index twice.

Follow Up:

Try to do this problem in O(N) time complexity. 

Write a query to find names of the customers who have purchased less than or equal to one product. Order the output by customer name. Given customer table with customer id and customer name , product table with product id , corresponding customer id and product name.

Write a query to find average marks of each class using the given table. The output should be rounded off to 4 decimal places and sorted based on the calls.
A single table with student information is provided

Query to retrieve the employee name with second maximum salary from given table (there are 3 tables Employee(ID,name), Salary(Esalary,post) , Works For(ID,Salary)).

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 a Singly Linked List of integers. Return true if it has a cycle, else return false.

A cycle occurs when a node's next points back to a previous node in the list.

Example:

In the given linked list, there is a cycle, hence we return true.

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