10+ NTT DATA, Inc. Interview Questions and Answers

Find the length of the longest substring without repeating characters in a given string.

• Use a sliding window approach to keep track of the longest substring without repeating characters.

• Use a hashmap to store the index of each character as it appears in the string.

• Update the start index of the window when a repeating character is found.

• Calculate the maximum length of the window as you iterate through the string.

• Return the maximum length as the result.

Find the smallest positive integer that cannot be expressed as the sum of elements from any proper subset of a non-decreasing sorted array of positive numbers.

• Sort the array in non-decreasing order

• Iterate through the array and keep track of the smallest sum that can be formed

• If the next element in the array is greater than the current sum + 1, then the answer is the current sum + 1

• Return the answer as the smallest integer not representable as a subset sum

To identify revenue gaps, I would implement a data-driven approach and analyze sales trends, customer behavior, and market competition.

• Analyze sales trends and identify any patterns or changes

• Examine customer behavior and feedback to identify areas of improvement

• Research market competition and adjust pricing or marketing strategies accordingly

• Utilize data analytics tools to track and measure the effectiveness of any implemented changes

• Develop a roadmap for improvement based o...read more

HashMap is non-synchronized and allows null values, while Hashtable is synchronized and does not allow null values.

• HashMap is non-synchronized and not thread-safe, while Hashtable is synchronized and thread-safe.

• HashMap allows null values and one null key, while Hashtable does not allow null keys or values.

• HashMap is generally preferred for non-thread-safe applications, while Hashtable is used in thread-safe scenarios.

• Example: HashMap<String, Integer> map = new HashMap<>(); H...read more

I have handled over 50 SMB accounts/clients in my previous roles.

• Managed a portfolio of 30 SMB clients in my previous job

• Successfully onboarded and managed 20 new SMB accounts in the last year

• Handled a mix of B2B and B2C SMB clients in my previous roles

• Collaborated with sales team to acquire and manage 10 new SMB accounts

Cloud computing refers to the delivery of computing services over the internet.

• Cloud computing allows users to access and store data and applications on remote servers instead of on local devices.

• It offers scalability, flexibility, and cost-effectiveness for businesses.

• Examples of cloud services include Amazon Web Services (AWS), Microsoft Azure, and Google Cloud Platform.

Data security techniques protect sensitive information from unauthorized access and breaches.

• Encryption: Transforming data into a coded format to prevent unauthorized access (e.g., AES, RSA).

• Access Control: Implementing user permissions to restrict data access (e.g., Role-Based Access Control).

• Data Masking: Obscuring specific data within a database to protect it (e.g., showing only the last four digits of a credit card).

• Regular Audits: Conducting periodic reviews of data acce...read more

Cloud is like a virtual storage space where you can access and store data and applications over the internet.

• Explain that the Cloud is like a virtual storage space accessed over the internet

• Mention that it allows you to store and access data and applications remotely

• Compare it to a physical hard drive, but located online instead of on your device

To find the loop in a linked list, use Floyd's Cycle Detection Algorithm.

• Use two pointers, slow and fast, to traverse the linked list.

• If there is a loop, the fast pointer will eventually meet the slow pointer.

• Once they meet, move one pointer back to the head and start moving both pointers one node at a time until they meet again. This meeting point is the start of the loop.

Active Directory is a directory service developed by Microsoft for Windows domain networks.

• Centralized database for managing network resources

• Stores information about users, computers, and other network objects

• Allows for centralized authentication and authorization

• Facilitates management of security policies and access controls

SharePoint is a web-based collaborative platform that integrates with Microsoft Office.

• SharePoint allows for document management, collaboration, and workflow automation.

• Users can create sites to share information, documents, and tasks with team members.

• It integrates with Microsoft Office applications like Word, Excel, and PowerPoint.

• SharePoint can be used for intranet portals, document management, and enterprise search.

Sitemap is a file that lists all the pages of a website while Console is a tool used to monitor website performance and search engine visibility.

• Sitemap is a file that helps search engines to crawl and index all the pages of a website.

• Console is a tool provided by search engines like Google to monitor website performance, search engine visibility, and fix issues.

• Sitemap is an XML file that contains information about the website's pages, their priority, and last modified date....read more