LG Soft India C Developer Interview Questions and Answers

Round duration - 150 Minutes
Round difficulty - Medium

Have to attempt 2 programming questions within 2:30 hours. Can take any time over the weekend. Relatively easy problems. Questions were long, but the solution code was small.

Q1. 
The Skyline Problem
Compute the skyline of given rectangular buildings in a 2D city, eliminating hidden lines and forming the outer contour of the silhouette when viewed from a distance. Each building is ...read more
Ans. 
Compute the skyline of given rectangular buildings in a 2D city, eliminating hidden lines and forming the outer contour of the silhouette.
• Iterate through the buildings and create a list of critical points (x, y) where the height changes.

• Sort the critical points based on x-coordinate and process them to generate the skyline.

• Merge consecutive horizontal segments of equal height to ensure no duplicates in the output.
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Q2. 
MergeSort Linked List Problem Statement
You are given a Singly Linked List of integers. Your task is to sort the list using the 'Merge Sort' algorithm.
Input:
The input consists of a single line contain...read more
Ans. 
Sort a Singly Linked List using Merge Sort algorithm.
• Implement the Merge Sort algorithm for linked lists.

• Divide the list into two halves, sort each half recursively, then merge them.

• Use a fast and slow pointer to find the middle of the list for splitting.

• Handle the base case of a single node or empty list.

• Example: Input: 4 3 2 1 -1, Output: 1 2 3 4
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Round duration - 240 Minutes
Round difficulty - Medium

Had to solve 1 programming question in 4 hours. It was in the morning on a weekend. The environment was not so good. It was a small institute and got very crowded. The platform was also buggy. but the question was not difficult. Was able to solve it in just 1 hour and leave.

Q1. 
Batch Photography Problem
Alex has acquired a machine that can photocopy photos in batches of a minimum size 'K'. Given 'N' photos with resolutions represented in an integer array photos, the machine prod...read more
Ans. 
Minimize maximum error by splitting photos into batches of size at least 'K'.
• Sort the array of resolutions in ascending order.

• Iterate through the array and calculate the error for each possible batch.

• Return the minimum possible maximum error found.
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Round duration - 30 Minutes
Round difficulty - Easy

It was in the afternoon. The interviewer basically asked me what technologies I have worked on. Checked my knowledge of those technologies with simple questions. Told me what I'll be working on if I get selected.

Q1. 
Sort 0 1 2 Problem Statement
Given an integer array arr of size 'N' containing only 0s, 1s, and 2s, write an algorithm to sort the array.
Input:
The first line contains an integer 'T' representing the n...read more
Ans. 
Sort an integer array containing only 0s, 1s, and 2s in linear time complexity.
• Use three pointers to keep track of the positions of 0s, 1s, and 2s in the array.

• Iterate through the array and swap elements based on the values encountered.

• Maintain left pointer for 0s, right pointer for 2s, and current pointer for traversal.

• Example: If current element is 0, swap it with element at left pointer and increment both pointers.

• E...read more
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Round duration - 90 Minutes
Round difficulty - Hard

It was also in the afternoon. The interviewer was the member of the team I'll be working on if I get selected. He asked me some basic questions about related technologies.
Gave me 2-3 DS & Algo problems and asked me to solve them.

Q1. 
Array Sum Calculation
Calculate the sum of all elements in an array of length N.
Input:
Line 1: An integer N indicating the size of the array.
Line 2: N integers, the elements of the array, separated by ...read more
Ans. 
Calculate the sum of all elements in an array of length N.
• Iterate through the array and add each element to a running sum.

• Return the final sum as the output.
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Q2. 
Ninja and Alien Language Order Problem
An alien dropped its dictionary while visiting Earth. The Ninja wants to determine the order of characters used in the alien language, based on the given list of wor...read more
Ans. 
Determine the order of characters in an alien language based on a list of words.
• Create a graph where each character is a node and there is a directed edge from character 'a' to character 'b' if 'a' comes before 'b' in any word.

• Perform a topological sort on the graph to get the order of characters.

• Return the order as a string in lexicographical order.
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Round duration - 120 minutes
Round difficulty - Easy

Round duration - 90 minutes
Round difficulty - Medium

The round contains mcqs on core java , javascript , oops and two coding questions of data structures.
The exam was at 7pm
Platform was good

Q1. 
Submatrix Sum Query
Given a 2-dimensional array ARR with 'N' rows and 'M' columns, and a set of queries in a 2-dimensional array Queries of size 'K', each query contains four integers that denote the top-...read more
Ans. 
Given a 2D array and a set of queries, find the sum of elements within specified submatrices for each query.
• Parse input to get array dimensions, elements, and queries

• Iterate through queries and calculate sum of elements within specified submatrix

• Output the sum for each query
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Q2. 
String Rotation Problem Statement
You are given a string named str and an integer D. Your task is to perform both left (anticlockwise) and right (clockwise) rotations on the given string by D units, start...read more
Ans. 
Implement functions to perform left and right rotations on a given string by a specified number of positions.
• Implement a function leftRotate() to perform left rotation on the string by D units.

• Implement a function rightRotate() to perform right rotation on the string by D units.

• Return the modified string after each rotation.

• Ensure to handle cases where D can be greater than the length of the string.
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Normal quantitative and data analytics questions

Implement a function to check if a given string is palindrome

Q1. Question on C++ / OOPs
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Q1. Why do you want to join this company ?
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Q1. Explain linked list
Ans. 
A linked list is a linear data structure where each element is a separate object with a pointer to the next element.
• Linked list is made up of nodes

• Each node contains data and a pointer to the next node

• Can be singly or doubly linked

• Insertion and deletion is faster than arrays

• Traversal is slower than arrays
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Q2. Interace and abstract class
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3 coding questions 12 mcq's

Q1. Stacks and implement stacks
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Q2. Done with the two questions then CORE subjects
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Q1. Ibiilvvivuovuolvul
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Q2. Ihlvilh ihlvhlvlvul
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