Global Visa Online Interview Questions and Answers

Find the node where two linked lists merge, return -1 if no merging occurs.

• Traverse both lists to find the lengths and the last nodes

• Align the starting points of the lists by adjusting the pointers

• Traverse again to find the merging node or return -1 if no merging occurs

Determine if any two intervals overlap based on start and end times.

• Iterate through intervals and check for any overlapping intervals by comparing start and end times.

• Sort the intervals based on start times to optimize the solution.

• Consider edge cases where intervals end and start at the same time but are not considered overlapping.

Return the middle node of a singly linked list, or the second middle node if count is even.

• Traverse the linked list with two pointers, one moving twice as fast as the other

• When the fast pointer reaches the end, the slow pointer will be at the middle

• If count is even, return the second middle node

• Handle edge cases like single node or no midpoint

The problem involves finding the number of ways to express a given integer as a sum of cubes of two integers.

• Iterate through all possible values of A and B within the given constraints.

• Check if A^3 + B^3 equals the given integer N.

• Count the valid pairs of A and B that satisfy the condition.

• Return the count of valid pairs for each test case.

Discussing the low-level design of a system similar to Flipkart

• Divide the system into modules like user authentication, product catalog, shopping cart, payment gateway

• Discuss the data flow between these modules and how they interact with each other

• Explain the database schema design for storing user information, product details, and order history

• Consider scalability and performance optimizations like caching, load balancing, and database sharding

• Discuss the technology stack us...read more

Threading is a way for a program to execute multiple tasks concurrently. Different scheduling algorithms determine the order in which threads are executed.

• Threading allows multiple tasks to run concurrently within a single process.

• Scheduling algorithms determine the order in which threads are executed, such as First-Come-First-Served (FCFS), Round Robin, Priority-Based Scheduling, etc.

• FCFS schedules threads based on their arrival time, Round Robin assigns a fixed time slice t...read more