Wissen Technology Interview Questions and Answers for Freshers

A javascript function to find the maximum and minimum occurrence of a letter in a string.

• Create an object to store the count of each letter in the string

• Loop through the string and update the count in the object

• Find the maximum and minimum count in the object and return the corresponding letters

Anagrams in a given word

• Create a function to find all possible anagrams of a given word

• Use a hash table to store the frequency of each character in the word

• Generate all possible permutations of the characters and check if they exist in the hash table

Optimizing prime number algorithms is crucial for efficient computation in software development.

• Optimizing prime number algorithms can improve the performance of applications that rely on prime numbers, such as cryptography or number theory.

• Efficient algorithms like the Sieve of Eratosthenes can significantly reduce the time complexity of finding prime numbers.

• Using techniques like memoization or dynamic programming can further optimize prime number generation.

• Optimizing prim...read more

Use sorting or heap data structure to find k largest elements in an array of strings.

• Sort the array in descending order and return the first k elements.

• Use a max heap data structure to efficiently find the k largest elements.

• Examples: ['apple', 'banana', 'orange', 'kiwi'], k=2 -> ['orange', 'kiwi']

Remove duplicates from array of strings

• Create a Set to store unique strings

• Iterate through the array and add each string to the Set

• Convert the Set back to an array to get the unique strings

A program to find the next palindrome number after a given number.

• Convert the given number to a string to easily manipulate individual digits.

• Increment the number by 1 and check if it is a palindrome.

• If not a palindrome, repeat the process until a palindrome is found.

The question is about finding anagrams in a given string.

• An anagram is a word or phrase formed by rearranging the letters of another word or phrase.

• To find anagrams in a string, we can use a hashmap to store the frequency of characters in each word.

• We can iterate through the string and for each substring of length equal to the length of the target word, check if it is an anagram.

• If the frequency of characters in the substring matches the frequency of characters in the target ...read more

Find the maximum sum of a subarray of size k in an array of integers.

• Use a sliding window approach to keep track of the sum of the current subarray.

• Slide the window by adding the next element and subtracting the previous element.

• Keep track of the maximum sum encountered so far.

• Return the maximum sum found.