Fullstack Developer

You have a 2D grid of ‘N’ rows and ‘M’ columns which are initially filled with water. You are given ‘Q’ queries each consisting of two integers ‘X’ and ‘Y’ and in each query operation, you have to turn the water at position (‘X’, ‘Y’) into a land. You are supposed to find the number of islands in the grid after each query.

An island is a group of lands surrounded by water horizontally, vertically, or diagonally.

You are given an array of integers of size ‘N’. You have to make the elements of the array equal, and the cost of changing the element ‘x’ to ‘y’ is abs(x -y). Your task is to find the minimum cost to make the elements of the array equal.

For example:

Consider ARR = [3, 4, 5] now suppose if we want to change every element value to 4, then the cost of changing 3 to 4 is |3 - 4| which is 1, and the cost of changing 5 to 4 is |5 - 4| which is 1, so the total cost is 1 + 1 = 2. The value 2 is the minimum cost to make all values in the array equal. Hence, the answer is 2.

You are given an integer array ‘ARR’. You have to find the length of the shortest contiguous subarray such that, if you sort this subarray in ascending order, then the whole array will be sorted in ascending order.

An array 'C' is a subarray of array 'D' if it can be obtained by deletion of several elements(possibly zero) from the beginning and the end from array 'D'.

Example:

Let’s say we have an array 'ARR' {10, 12, 20, 30, 25, 40, 32, 31, 35, 50, 60}. Then we have to find the subarray {30 , 25 , 40 , 32 , 31 , 35} and print its length = 5 as our output. Because, when we sort this subarray the whole array will be sorted.

You are given an array 'ARR' of 'N' positive integers. You need to find the minimum number of operations needed to make all elements of the array equal. You can perform addition, multiplication, subtraction or division with any element on an array element.

Addition, Subtraction, Multiplication or Division on any element of the array will be considered as a single operation.

Example:

If the given array is [1,2,3] then the answer would be 2. One of the ways to make all the elements of the given array equal is by adding 1 to the array element with value 1 and subtracting 1 from the array element with value 3. So that final array would become [2,2,2]. 

You are given three rods (numbered 1 to 3), and ‘N’ disks initially placed on the first rod, one on top of each other in increasing order of size ( the largest disk is at the bottom). You are supposed to move the ‘N’ disks to another rod(either rod 2 or rod 3) using the following rules and in less than 2 ^ (N) moves.

1. You can only move one disk in one move. 
2. You can not place a larger disk on top of a smaller disk.
3. You can only move the disk at the top of any rod.    

Note :

You may assume that initially, the size of the ‘i’th disk from the top of the stack is equal to ‘i’, i.e. the disk at the bottom has size ‘N’, the disk above that has size ‘N - 1’, and so on. The disk at the top has size 1.

Example :

Relationships, Scaling, Load Balancing, and few complex queries on SQL Joins.

Multithreading and Semaphore.

You have been given two integers 'N' and 'D', Your task is to find the square root of the number 'N' with precision up to 'D' decimal places i.e. the difference between your answer and the correct answer should be less than 10 ^ (-D).

For example if N = 10 and D = 3, then your answer will be 3.162.