10+ Housing.com Software Developer Interview Questions and Answers

Find the maximum level sum in a binary tree with integer nodes.

• Traverse the binary tree level by level and calculate the sum of nodes at each level.

• Keep track of the maximum level sum encountered so far.

• Return the maximum level sum as the output.

Find the maximum sum of a non-empty subarray from a circular array.

• Identify the maximum sum of a non-empty subarray within the circular array

• Consider both normal and circular subarrays to find the maximum sum

• Implement a function to solve the problem efficiently

Implement a function to compute the sum of two large integers given as strings.

• Convert the input strings to integers and add them digit by digit from right to left, considering carry over.

• Handle cases where one number is longer than the other by padding with zeros.

• Return the final sum as a string.

Replace spaces in a string with '@40'.

• Iterate through the string and replace spaces with '@40'.

• Use string manipulation functions to achieve the desired output.

• Handle multiple test cases by looping through each input string.

The problem involves determining the minimum time required to paint all boards with a given number of painters.

• Iterate through the array to find the maximum board length.

• Use binary search to find the minimum time required to paint all boards.

• Optimize the painting process by assigning continuous sections of boards to painters.

Given a string without spaces and a dictionary of words, generate all possible sentences by inserting spaces.

• Use backtracking to generate all possible combinations of words from the dictionary to form sentences

• Iterate through the string and try to match substrings with words from the dictionary

• Recursively build sentences by adding words that match the substrings

• Return all valid sentences formed

Check if an array can be partitioned into two subarrays with equal sum.

• Iterate through the array and calculate the total sum of all elements.

• If the sum is odd, return false as it cannot be divided into two equal parts.

• If the sum is even, try to find a subset with sum equal to half of the total sum.

• Use dynamic programming or backtracking to find the subset sum.

Find the length of the longest substring without repeating characters in a given string.

• Use a sliding window approach to keep track of the longest substring without repeating characters.

• Use a hashmap to store the index of each character in the string.

• Update the start index of the window when a repeating character is encountered.

• Calculate the maximum length of the substring as you iterate through the string.

• Return the maximum length of the substring at the end.

It is not possible to add two integers that cannot be stored even in long long int.

• The maximum value that can be stored in long long int is 9,223,372,036,854,775,807.

• Any two integers whose sum exceeds this value cannot be stored in long long int.

• In such cases, a different data type or approach is required to handle the large numbers.

The function decodes a URL-encoded string by replacing specific characters with their corresponding symbols.

• Iterate through each character in the input string

• If the character is '%', check the next two characters to determine the replacement symbol

• Replace the '%XX' sequence with the corresponding symbol

• Continue until all occurrences of '%XX' are replaced

The maximum contiguous circular sum in an array is the maximum sum that can be obtained by wrapping the array around in a circular manner.

• To find the maximum contiguous circular sum, we can use Kadane's algorithm twice.

• First, we find the maximum sum using Kadane's algorithm for the non-circular array.

• Then, we find the maximum sum using Kadane's algorithm for the circular array by subtracting the minimum sum subarray from the total sum of the array.

• The maximum of these two sum...read more

Use binary search algorithm with slight modifications to handle rotated sorted array efficiently.

• Find the pivot point where the array is rotated.

• Determine which half of the array the target value lies in based on the pivot point.

• Perform binary search on the appropriate half of the array.

Find the length of the longest substring without any repeating characters.

• Use a sliding window approach to iterate through the string.

• Keep track of the characters seen so far using a set.

• Update the maximum length of the substring whenever a repeating character is encountered.

Given a binary tree, print sum of each level

• Use a breadth-first search (BFS) algorithm to traverse the tree level by level

• Keep track of the sum of each level using a separate variable for each level

• Print the sum of each level after traversing the entire tree