SDE

You are given a positive integer N, and you have to find the number of ways to represent N as a sum of cubes of two integers(let’s say A and B), such that:

N = A^3 + B^3.

Note:

1. A should be greater than or equal to one (A>=1).
2. B should be greater than or equal to zero (B>=0).
3. (A, B) and (B, A) should be considered different solutions, if A is not equal to B, i.e (A, B) and (B, A) will not be distinct if A=B.

You are given a number ‘N’ and a query ‘Q.’ If ‘Q’ is 1, then you have to return the sum of all integers from 1 to ‘N,’ else if ‘Q’ is equal to 2 then you have to return the product of all integers from 1 to ‘N.’ Since the product can be very large, return it modulo 10 ^ 9 + 7.

For example

Given ‘N’ = 4, ‘Q’ = 1. 
Then the answer is 10 because the sum of all integers between 1 and 4 are 1, 2, 3, and 4. Hence 1 + 2 + 3 + 4 is equal to 10.

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-

Write a query to select only unique values from the department column in the employees table. 

How can you retrieve rows from a table where the salary is greater than 5000? 

Tell us about Joins. (Learn)

Write a query to find the employee with the highest salary in the employees table using a subquery.