10+ Google Senior Software Engineer Interview Questions and Answers

Find the maximum value by jumping to any number and multiplying jump length by value at the location.

• Iterate through the array and calculate the maximum value for each possible jump

• Keep track of the maximum value found so far

• Return the maximum value

Try to troubleshoot the wifi connection issue by checking settings, restarting devices, and seeking help from IT support.

• Check if the wifi is turned on and the correct network is selected

• Restart the wifi router and the device

• Contact IT support for assistance in retrieving the password

Using a robot to sort boxes by their ID in ascending order.

• Create a list of boxes with their IDs

• Program the robot to pick up boxes based on their ID

• Use a sorting algorithm to sort the list of boxes by ID

• Program the robot to move the boxes in the sorted order

Iterate through array, calculate value at each index, keep track of maximum value

• Iterate through the array and calculate the value at each index by multiplying jump length with value of location

• Keep track of the maximum value encountered during the iteration

• Return the maximum value found

Find the number of combinations to achieve a target with given coins of denomination 2 and 5

• Use dynamic programming approach

• Create a table to store the number of combinations for each target value

• Base cases: 0 can be achieved in 1 way, all negative values can be achieved in 0 ways

• For each coin, update the table with the number of combinations for each target value

Find length of largest arithmetic sequence in binary tree.

• Traverse the tree and for each node, calculate the length of the longest arithmetic sequence that includes that node.

• Use dynamic programming to store the length of the longest arithmetic sequence for each node.

• The length of the longest arithmetic sequence for a node is the maximum of the lengths of the longest arithmetic sequences for its left and right children plus one if the node is part of an arithmetic sequence.

Program to find the maximum subarray sum using Kadane's algorithm

• Initialize max_so_far and max_ending_here to 0

• Iterate through the array and update max_ending_here with the maximum of current element or current element + max_ending_here

• Update max_so_far with the maximum of max_so_far and max_ending_here

Implement a program to find the longest common subsequence of two strings.

• Use dynamic programming to solve this problem efficiently.

• Create a 2D array to store the lengths of longest common subsequences of substrings.

• Trace back the array to reconstruct the longest common subsequence.

Topological sort is used to order a directed graph's nodes in a way that all edges go from earlier to later nodes.

• Create a graph data structure to represent the dependencies between operations.

• Use a depth-first search algorithm to perform the topological sort.

• Start by selecting a node with no incoming edges as the first operation to be performed.

• Remove this node and its outgoing edges from the graph, then repeat the process with the remaining nodes.

• Repeat until all nodes have...read more

Transliteration logic converts text from one script to another, typically preserving pronunciation.

• Transliteration is not the same as translation, it focuses on converting characters from one script to another.

• Commonly used for European languages like Greek, Cyrillic, and Latin scripts.

• Transliteration rules vary by language, for example, converting Cyrillic 'ш' to Latin 'sh'.

System design involves creating a high-level design of a software system, followed by implementing the detailed low-level design.

• Start by understanding the requirements and constraints of the system

• Create a high-level design that outlines the components and interactions of the system

• Implement the detailed low-level design, considering factors like scalability, performance, and maintainability

• Use tools like UML diagrams, flowcharts, and sequence diagrams to visualize the desig...read more

Clone a tree by creating a mirror image of it

• Traverse the original tree in a post-order manner

• Create a new node for each visited node and assign its value

• Recursively set the left child of the new node as the mirrored right child of the original node

• Recursively set the right child of the new node as the mirrored left child of the original node

Design an IP blocking system to prevent unauthorized access to a network.

• 1. Maintain a list of blacklisted IP addresses.

• 2. Implement a firewall to block incoming traffic from blacklisted IPs.

• 3. Regularly update the blacklist based on security threats.

• 4. Consider implementing rate limiting to prevent brute force attacks.

• 5. Monitor and log blocked IP addresses for analysis.

System Design with HLD involves designing the high-level architecture of a software system.

• Understand the requirements and constraints of the system

• Identify the components and their interactions

• Consider scalability, reliability, and performance

• Use design patterns and best practices

• Create diagrams like UML or flowcharts to visualize the design

Design a scalable ID generator service for unique identification of entities.

• Use a combination of timestamp, unique machine identifier, and sequence number to generate IDs.

• Implement a distributed system to ensure uniqueness of generated IDs.

• Consider using a centralized service for ID generation to avoid conflicts.

• Use a high-performance database for storing generated IDs.

• Implement error handling and retry mechanisms in case of failures.