Saturn Auto Links Interview Questions and Answers

Find and print the longest substring with k unique characters in an array of strings.

• Iterate through the array of strings and keep track of the longest substring with k unique characters.

• Use a sliding window approach to efficiently find the longest substring.

• Keep a hashmap to store the frequency of characters in the current window.

• Update the window boundaries based on the number of unique characters.

• Return the longest substring found.

Find the missing smallest positive integer in an array of integers

• Sort the array to easily identify missing integers

• Iterate through the sorted array to find the smallest missing positive integer

• Return the missing integer

Generate all possible subsequences of a given string.

• Use recursion to generate all possible combinations of characters in the string.

• At each step, include or exclude the current character to form subsequences.

• Store each subsequence in an array of strings.

Sort an array of strings containing only 0, 1, and 2.

• Use a three-way partitioning algorithm like Dutch National Flag algorithm to sort the array in a single pass.

• Keep track of three pointers - low, mid, and high to partition the array into three sections.

• Swap elements based on their values to achieve the sorted array.

The Dutch Flag problem involves sorting an array of strings with three possible values in a specific order.

• Create three pointers to keep track of the boundaries of each color group

• Iterate through the array and swap elements to group them in the correct order

• Time complexity of O(n) can be achieved by a single pass through the array

A palindrome is a word, phrase, number, or other sequence of characters that reads the same forward and backward.

• Use dynamic programming to solve this problem efficiently.

• Iterate through the string and expand around each character to find the longest palindrome.

• Consider both odd and even length palindromes.

• Example: Input 'babad', Output 'aba' or 'bab'.