SDE - 1

Given a C++ program, it is not doing what it is supposed to do, fix it without changing more than 1 line

You have been given a grid ‘ARR’ of size ‘N' * M’. ‘ARR[i][j]’ is ‘1’ if the computer is present at position ‘(i,j)’ otherwise it is zero. A computer is said to be a connected computer if there is a computer in its row or column other than itself. Your task is to return the number of connected computers.

Example:

Let’s say you have a grid [[1,0],[1,1]]. We can say the computer ‘ARR[0][0]’ is a connected computer because there is a computer in its column other than itself. We can say the computer ‘arr[1][0]’ is a connected computer because there is a computer in its row and column other than itself. We can say the computer ‘arr[1][1]’ is a connected computer because there is a computer in its row other than itself. Therefore the number of connected computers is 3.

Given a binary tree and the value of two nodes, find the distance between the given two nodes of the Binary Tree.

Distance between two nodes is defined as the minimum number of edges in the path from one node to another.

You are given an unweighted directed graph of 'V' vertices and 'E' edges. Your task is to print all the strongly connected components (SCCs) present in the graph.

Given n servers, we need to store blobs in those servers and we should make K replicas of each blob. I was supposed to discuss HLD of this, make LLD and also write some code for APIs (i wasn't asked to run the code though)

This was mostly discussion with manager, we discussed about my projects that i had mentioned in resume, after that manager asked very basic OS questions like - 
1. what is a system call
2. what is kernel mode