Wipro Interview Questions and Answers

The task is to determine the number of ways to paint a fence with 'N' posts using 'K' different colors, with the constraint that not more than two adjacent posts have the same color.

• Use dynamic programming to solve the problem efficiently.

• Consider the cases where the last two posts have the same color and different colors separately.

• Keep track of the number of ways to paint the fence at each post using a 2D array.

• Apply modulo 10^9 + 7 to avoid overflow issues.

• Return the final...read more

Reverse a given string containing alphabets, numbers, and special characters.

• Iterate through the string from the end to the beginning and append each character to a new string.

• Use built-in functions like reverse() or slicing to reverse the string.

• Handle special characters and numbers while reversing the string.

• Ensure to consider the constraints on the length of the string and number of test cases.

Implement a function to delete a node at a specified position in a linked list.

• Traverse the linked list to find the node at the specified position.

• Update the pointers to skip over the node to be deleted.

• Handle edge cases like deleting the head or tail of the linked list.

• Return the modified linked list.

The angle between the minute and hour hand at 1:15 is 7.5 degrees.

• At 1:15, the minute hand is at 3 and the hour hand is slightly past 1

• Calculate the angles covered by each hand from 12 o'clock position

• Subtract the smaller angle from the larger angle to get the angle between the hands

Count the total number of unique pairs in an array whose elements sum up to a given value.

• Use a hashmap to store the frequency of each element in the array.

• Iterate through the array and for each element, check if (Sum - current element) exists in the hashmap.

• Increment the count of pairs if the complement exists in the hashmap.

• Divide the count by 2 to avoid counting duplicates like (arr[i], arr[j]) and (arr[j], arr[i]) separately.

Replacing the screen of your old phone may not be cost-effective in the long run. Buying a new phone can offer better features and performance.

• Replacing the screen may not fix other potential issues with the phone

• A new phone may offer better camera, battery life, and processing power

• You can take advantage of new technology and features with a new phone

• The cost of replacing the screen may be close to the cost of a new phone

• A new phone may come with a warranty and better custom...read more

The event loop in JavaScript is responsible for handling asynchronous operations by continuously checking the call stack and the callback queue.

• The event loop continuously checks the call stack for any functions that need to be executed.

• If the call stack is empty, the event loop checks the callback queue for any asynchronous tasks that have completed.

• The event loop then pushes these tasks onto the call stack for execution.

• Example: setTimeout() function in JavaScript uses the ...read more