VVC MOTORS Interview Questions and Answers

Connect nodes of a tree on the same level

• Use a queue to traverse the tree level by level

• For each level, connect the nodes using their next pointer

• If a node has no next node, set its next pointer to null

Add two numbers represented as a linked list

• Traverse both linked lists and add corresponding nodes

• Handle carry over to next node

• Create a new linked list to store the result

Left view of a binary tree is the set of nodes visible when the tree is viewed from the left side.

• The leftmost node at each level is included in the left view.

• Use depth-first search to traverse the tree and keep track of the maximum level seen so far.

• If the current node is at a level greater than the maximum level seen so far, add it to the left view and update the maximum level seen.

The right view of a binary tree shows the rightmost node at each level.

• Traverse the tree in a depth-first manner, starting from the right child of each node.

• Keep track of the current level and only add the rightmost node of each level to the result.

• Example: For the tree [1,2,3,null,5,null,4], the right view is [1,3,4].

Count the number of 2s in a given number

• Iterate through each digit of the number and count the occurrences of 2

• Convert the number to a string for easier manipulation

• Handle edge cases like negative numbers or zero