10+ Smash Elevators Interview Questions and Answers

Identify and list nodes in a Binary Tree that do not have a sibling.

• Traverse the Binary Tree in level order to identify sibling nodes.

• Keep track of nodes without siblings and output them in ascending order.

• Handle cases where nodes have only one child or no children.

• Consider the root node as a sibling node.

• Sort the output list of nodes without siblings in ascending order.

Find the contiguous subarray with the maximum product of elements in an array.

• Iterate through the array and keep track of the maximum and minimum product ending at each index.

• Update the maximum product by taking the maximum of current element, current element * previous maximum, current element * previous minimum.

• Update the minimum product by taking the minimum of current element, current element * previous maximum, current element * previous minimum.

• Return the maximum produc...read more

Evaluate postfix expressions by applying operators after operands. Return result modulo (10^9+7).

• Iterate through each character in the postfix expression

• If character is an operand, push it onto the stack

• If character is an operator, pop two operands from stack, apply operator, and push result back

• Repeat until end of expression, return final result modulo (10^9+7)

Merge overlapping intervals and return sorted list of merged intervals.

• Identify overlapping intervals based on start and end times

• Merge overlapping intervals to form new intervals

• Sort the merged intervals in ascending order of start times

Output all edges in any shortest path from x to y in an undirected weighted graph

• Use Dijkstra's algorithm to find all shortest paths from x to y

• Store the predecessor of each vertex to reconstruct the paths

• Output all edges in any of the shortest paths found

Given a string and pairs of indices, output the lexicographically smallest string after swapping characters.

• Sort the pairs based on the first index in ascending order.

• Use union-find data structure to keep track of connected components.

• Swap characters in the string based on the connected components.

• Return the lexicographically smallest string.

To find the country of an IP address from a CSV file, we can use a lookup table based on the IP address range.

• Create a lookup table from the CSV file with IP address ranges and corresponding country codes

• Parse the given IP address and match it with the ranges in the lookup table to find the corresponding country code

• Use binary search for efficient lookup in the IP address ranges

• Handle cases where the given IP address falls outside the ranges in the lookup table

Design a streaming service like Netflix and explain content onboarding process.

• Create a user-friendly dashboard for content providers to submit new content.

• Implement a review process to ensure quality and compliance with guidelines.

• Use algorithms to categorize and recommend new content to users based on their preferences.

• Negotiate licensing deals with production companies to acquire new content.

• Regularly update the library with fresh content to keep users engaged.

To detect a loop in a linked list, we can use Floyd's Cycle Detection Algorithm.

• Use two pointers, one moving at twice the speed of the other

• If there is a loop, the two pointers will eventually meet at some point

• Alternatively, use a hash set to store visited nodes and check for duplicates

The angle between the hour hand and minute hand of a clock can be calculated using a simple formula.

• The angle between the hour hand and minute hand is given by the formula: |(30H - 11/2) - 6M| degrees

• H is the hour hand position and M is the minute hand position

• If the result is greater than 180 degrees, subtract it from 360 degrees to get the acute angle