Athenahealth Technology Interview Questions and Answers for Freshers

Find the sum of the subarray with the maximum sum among all subarrays in a given array.

• Iterate through the array and keep track of the maximum sum subarray seen so far.

• Use Kadane's algorithm to efficiently find the maximum subarray sum.

• Consider the case where all elements in the array are negative.

• Handle the case where the array contains only one element.

Find the maximum number of head-side up coins by flipping a continuous segment of coins.

• Iterate through the array and calculate the maximum number of head-side up coins without flipping.

• Iterate through the array and calculate the maximum number of head-side up coins after flipping a continuous segment.

• Compare the results from the above two steps to find the maximum number of head-side up coins obtainable.

Find the smallest positive integer missing from an array of integers.

• Iterate through the array and mark positive integers as visited by changing the sign of the corresponding index.

• After marking, iterate again to find the first positive integer with a positive value, which will be the smallest missing positive integer.

• Handle edge cases like all negative numbers, duplicates, and missing 1 separately.

Find the kth missing element in a sequence of integers.

• Iterate through the sequence to find missing elements.

• Keep track of the count of missing elements found.

• Return the kth missing element once count reaches k.

Find the longest palindromic substring in a given string, returning the rightmost one if multiple substrings are of the same length.

• Iterate through each character in the string and expand around it to check for palindromes

• Keep track of the longest palindromic substring found so far

• Return the rightmost longest palindromic substring

Implement Merge Sort algorithm to sort a sequence of numbers in non-descending order.

• Divide the input array into two halves recursively until each array has only one element.

• Merge the sorted halves to produce a completely sorted array.

• Time complexity of Merge Sort is O(n log n).

• Example: Input: [3, 1, 4, 1, 5], Output: [1, 1, 3, 4, 5]

Join tables on employee ID, filter by balance less than 200, select employee names.

• Join tables on employee ID attribute

• Filter rows where balance is less than 200

• Select employee names from the result

Tuple is a data structure that stores a fixed number of elements, while delete command is used to remove data from a database table.

• Tuple is used to store multiple values in a single variable, while delete command is used to remove specific rows from a database table.

• Tuples are immutable, meaning their values cannot be changed once they are set, while delete command permanently removes data from a table.

• Example: Tuple (1, 'apple', 3.14) vs. DELETE FROM table_name WHERE condit...read more