System Engineer

You are given a non-negative integer N. Your task is to apply the "reverse and add" process to find a resulting palindrome.

The process is as follows:

1)Take the number N.

2)Reverse its digits to create a new number, reversed_N.

3)Add the two numbers together: sum = N + reversed_N.

4)If sum is a palindrome, the process stops, and sum is the result.

5)If sum is not a palindrome, it becomes the new N, and the process repeats from step 1.

You must also handle two failure conditions:

If the process takes more than 1,000 additions to find a palindrome, it is considered a failure.

If at any step, the sum becomes greater than 4,294,967,295, the process also fails.

If the process fails, you should indicate that a palindrome does not exist under these conditions.

You are given an array 'ARR' of 'N' distinct positive integers. You are also given a non-negative integer 'B'.

Your task is to return all unique combinations in the array whose sum equals 'B'. A number can be chosen any number of times from the array 'ARR'.

Elements in each combination must be in non-decreasing order.

For example:

Let the array 'ARR' be [1, 2, 3] and 'B' = 5. Then all possible valid combinations are-

(1, 1, 1, 1, 1)
(1, 1, 1, 2)
(1, 1, 3)
(1, 2, 2)
(2, 3)

Write a SQL Query to find the second-largest salary from the salary table.

Write SQL queries for each type of join: Left Join, Right Join, Inner Join, and Full Outer Join.

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.