SDE - 1

You are given an array 'ARR' of N integers. Each integer represents the height of a balloon. So, there are N balloons lined up.

Your aim is to destroy all these balloons. Now, a balloon can only be destroyed if the player shoots its head. So, to do the needful, he/ she shoots an arrow from the left to the right side of the platform, from an arbitrary height he/she chooses. The arrow moves from left to right, at a chosen height ARR[i] until it finds a balloon. The moment when an arrow touches a balloon, the balloon gets destroyed and disappears and the arrow continues its way from left to right at a height decreased by 1. Therefore, if the arrow was moving at height ARR[i], after destroying the balloon it travels at height ARR[i]-1. The player wins this game if he destroys all the balloons in minimum arrows.

You have to return the minimum arrows required to complete the task.

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.

Given 'k' sorted linked lists, each list is sorted in increasing order. You need to merge all these lists into one single sorted list. You need to return the head of the final linked list.

For example:

Input:
3
3
4 6 8
3
2 5 7 
2
1 9

Output:
1 2 4 5 6 7 8 9 

Explanation:
First list is: 4 -> 6 -> 8 -> NULL
Second list is: 2 -> 5 -> 7 -> NULL
Third list is: 1 -> 9 -> NULL
The final list would be: 1 -> 2 -> 4 -> 5 -> 6 -> 7 -> 8 -> 9 -> NULL

You are given a set of ‘N’ rectangular envelopes. The height and width of each envelope are given by arrays, ‘height’ and ‘width’ respectively, each consisting of ‘N’ positive integers. The height, width of the ith envelope is given by ‘height[i]’ and ‘width[i]’ respectively.

You can put one envelope inside another envelope if and only if both the height and width of one envelope is strictly greater than the height and width of the other envelope.

What is the maximum number of envelopes you can Russian doll? (put one inside other)

Note

Rotation of envelope is not allowed, that is, height and width can’t be exchanged

What is method overloading?
What is the meaning of method overriding?
How can data abstraction be accomplished?
What is Thrashing?
What is Banker's Algorithm?
What is Deadlock?
How can we prevent Deadlock?

There are 3 ants sitting on three corners of a triangle. All ants randomly pick a direction and start moving along edge of the triangle. What is the probability that any two ants collide?