Pep&Joss Interview Questions and Answers

Program to mirror the pixel in a screen matrix of 24 bit pixels

• Create a 2D array to represent the screen matrix of pixels

• Iterate through each row and swap the pixels from left to right

• Ensure to handle the 24 bit pixels properly for mirroring

• Example: [[255, 0, 0], [0, 255, 0], [0, 0, 255]] -> [[0, 0, 255], [0, 255, 0], [255, 0, 0]]

Trees are hierarchical data structures with nodes connected by edges. Binary search is a search algorithm that finds the position of a target value within a sorted array.

• Trees are made up of nodes connected by edges, with a root node at the top and leaf nodes at the bottom.

• Binary search is a divide and conquer algorithm that compares the target value to the middle element of a sorted array.

• Binary search is efficient for searching in sorted arrays as it eliminates half of the ...read more

Max sub array refers to the contiguous subarray within an array that has the largest sum of elements.

• Max sub array problem is a common algorithmic problem in computer science.

• It involves finding the subarray with the largest sum of elements.

• Example: Given array [1, -2, 3, 4, -1, 2, 1, -5, 4], the max sub array is [3, 4, -1, 2, 1] with a sum of 9.

Find the longest increasing subsequence in an array.

• Use dynamic programming to solve this problem.

• Iterate through the array and keep track of the longest increasing subsequence ending at each index.

• Return the maximum length found.

Detecting a cycle in a graph using depth-first search or Floyd's cycle detection algorithm.

• Use depth-first search to detect a cycle in a graph by keeping track of visited nodes and checking for back edges.

• Alternatively, use Floyd's cycle detection algorithm for detecting a cycle in a linked list or graph.

• Example: For a graph with nodes A, B, C, D and edges (A->B, B->C, C->D, D->A), a cycle is detected when visiting node A again.

• Example: For a linked list with nodes 1, 2, 3, 4...read more

Software testing is the process of evaluating a software application to ensure it meets specified requirements and functions correctly.

• Identifying defects or bugs in the software

• Verifying that the software meets functional and non-functional requirements

• Ensuring the software is user-friendly and meets user expectations

• Types of testing include unit testing, integration testing, system testing, and acceptance testing