1500+ Associate Software Engineer Interview Questions and Answers

Q1. Triplets with Given Sum Problem

Given an array or list ARR consisting of N integers, your task is to identify all distinct triplets within the array that sum up to a specified number K.

Explanation:

A triplet i...read more

Q2. Best Time to Buy and Sell Stock II Problem Statement

Given the stock prices for a certain number of days, represented as an array, determine the maximum profit you can achieve. You may perform as many transacti...read more

Q3. Intersection of Two Arrays II

Given two integer arrays ARR1 and ARR2 of size N and M respectively, find the intersection of these arrays. An intersection refers to elements that appear in both arrays.

Note:

Inp...read more

Q4. Frog Jump Problem Statement

A frog is positioned on the first step of a staircase consisting of N steps. The goal is for the frog to reach the final step, i.e., the Nth step. The height of each step is provided...read more

Q6. Factorial Trailing Zeros Problem

You are provided with a positive integer N. Your goal is to determine the smallest number whose factorial has at least N trailing zeros.

Example:

Input:

N = 1

Output:

5

Explanat...read more

Q8. Ninja and Alternating Largest Problem Statement

Ninja is given a sequence of numbers and needs to rearrange them so that every second element is greater than its neighbors on both sides.

Example:

Input:

[1, 2, ...read more

Q9. Armstrong Number Problem Statement

You are provided an integer 'NUM'. Determine if 'NUM' is an Armstrong number.

Explanation:

An integer 'NUM' with 'k' digits is an Armstrong number if the sum of its digits, ea...read more

Q10. Intersection of Linked List Problem Statement

You are provided with two singly linked lists of integers. These lists merge at a node of a third linked list.

Your task is to determine the data of the node where ...read more

Q11. Kth Smallest and Largest Element Problem Statement

You are provided with an array 'Arr' containing 'N' distinct integers and a positive integer 'K'. Your task is to find the Kth smallest and Kth largest element...read more

Q12. Maximum Sum Increasing Subsequence of Length K Problem Statement

You are given an array NUMS consisting of N integers and an integer K. Your task is to determine the maximum sum of an increasing subsequence of ...read more

Q14. Palindrome String Validation

Determine if a given string 'S' is a palindrome, considering only alphanumeric characters and ignoring spaces and symbols.

Note:

The string 'S' should be evaluated in a case-insensi...read more

Q15. Add K Nodes Problem Statement

You are given a singly linked list of integers and an integer 'K'. Your task is to modify the linked list by inserting a new node after every 'K' node in the linked list. The value...read more

Q16. Longest Common Prefix After Rotation

You are given two strings 'A' and 'B'. While string 'A' is constant, you may apply any number of left shift operations to string 'B'.

Explanation:

Your task is to calculate ...read more

Q17. Tiling Problem Statement

Given a board with 2 rows and N columns, and an infinite supply of 2x1 tiles, determine the number of distinct ways to completely cover the board using these tiles.

You can place each t...read more

Q18. Pair Sum Problem Statement

You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to find and return a list of all pairs of elements where each sum of a pair equals 'S'.

Note:

Each pa...read more

Q19. Combination Sum Problem Statement

Given three integers X, Y, and Z, calculate the sum of all numbers that can be formed using the digits 3, 4, and 5. Each digit can be used up to a maximum of X, Y, and Z times ...read more

Q20. Equilibrium Index Problem Statement

Given an array Arr consisting of N integers, your task is to find the equilibrium index of the array.

An index is considered as an equilibrium index if the sum of elements of...read more

Q21. Find First Repeated Character in a String

Given a string 'STR' composed of lowercase English letters, identify the character that repeats first in terms of its initial occurrence.

Example:

Input:

STR = "abccba"...read more

Q22. Reverse Stack with Recursion

Reverse a given stack of integers using recursion. You must accomplish this without utilizing extra space beyond the internal stack space used by recursion. Additionally, you must r...read more

Q23. Shortest Path in Ninjaland

Ninjaland consists of ‘N’ states and ‘M’ paths. Each path connecting two states can either be a normal path or a special path, each with its unique length. Your task is to find the sh...read more

Q24. Sort By Kth Bit

Given an array or list ARR of N positive integers and an integer K, your task is to rearrange all elements such that those with the K-th bit (considering the rightmost bit as '1st' bit) equal to...read more

Q25. Balanced Parentheses Combinations

Given an integer N representing the number of pairs of parentheses, find all the possible combinations of balanced parentheses using the given number of pairs.

Explanation:

Con...read more

Q26. Chocolate Distribution Problem

You are given an array/list CHOCOLATES of size 'N', where each element represents the number of chocolates in a packet. Your task is to distribute these chocolates among 'M' stude...read more

Q27. Palindromic Substrings Problem Statement

You are given a string 'STR'. Your task is to determine the total number of palindromic substrings present in 'STR'.

Example:

Input:

"abbc"

Output:

5

Explanation:

The pa...read more

Q28. Prime Numbers within a Range

Given an integer N, determine and print all the prime numbers between 2 and N, inclusive.

Input:

Integer N

Output:

Prime numbers printed on separate lines

Example:

Input:

N = 10

Out...read more

Q29. Word Occurrence Counting

Given a string 'S' of words, the goal is to determine the frequency of each word in the string. Consider a word as a sequence of one or more non-space characters. The string can have mu...read more

Q31. Anagram Pairs Verification Problem

Your task is to determine if two given strings are anagrams of each other. Two strings are considered anagrams if you can rearrange the letters of one string to form the other...read more

Q32. Find Middle of Linked List

Given the head node of a singly linked list, your task is to return a pointer pointing to the middle node of the linked list.

When the number of elements is odd, return the middle ele...read more

Q34. Longest Path In Directed Graph Problem Statement

Given a Weighted Directed Acyclic Graph (DAG) comprising 'N' nodes and 'E' directed edges, where nodes are numbered from 0 to N-1, and a source node 'Src'. Your ...read more

Q35. Sub Sort Problem Statement

You are given an integer array ARR. Determine the length of the shortest contiguous subarray which, when sorted in ascending order, results in the entire array being sorted in ascendi...read more

Q36. Job Sequencing Problem Statement

You are provided with a N x 2 2-D array called Jobs consisting of N jobs. In this array, Jobs[i][0] represents the deadline of the i-th job, while Jobs[i][1] indicates the profi...read more

Q37. Largest BST Subtree Problem

Given a binary tree with 'N' nodes, determine the size of the largest subtree that is also a BST (Binary Search Tree).

Input:

The first line contains an integer 'T', representing the...read more

Q38. Power Set Generation

Given a sorted array of 'N' integers, your task is to generate the power set for this array. Each subset of this power set should be individually sorted.

A power set of a set 'ARR' is the s...read more

Q39. Prime Time Again Problem Statement

You are given two integers DAY_HOURS and PARTS. Consider a day with DAY_HOURS hours, which can be divided into PARTS equal parts. Your task is to determine the total instances...read more

Q40. First Unique Character in a String Problem Statement

Given a string STR consisting of lowercase English letters, identify the first non-repeating character in the string and return it. If no such character exis...read more

Q41. Implement Atoi Function

You have a string 'STR' of length 'N'. Your task is to implement the atoi function, which converts the string into an integer. If the string does not contain any numbers, the function sh...read more

Q42. Pythagorean Triplets Detection

Determine if an array contains a Pythagorean triplet by checking whether there are three integers x, y, and z such that x² + y² = z² within the array.

Input:

The first line contai...read more

Q43. Rearrange Array: Move Negative Numbers to the Beginning

Given an array ARR consisting of N integers, rearrange the elements such that all negative numbers are located before all positive numbers. The order of e...read more

Q44. Find the Longest Palindromic Substring

Given a string ‘S’ composed of lowercase English letters, your task is to identify the longest palindromic substring within ‘S’.

If there are multiple longest palindromic ...read more

Q45. Merge Sort Problem Statement

You are given a sequence of numbers, ARR. Your task is to return a sorted sequence of ARR in non-descending order using the Merge Sort algorithm.

Explanation:

The Merge Sort algorit...read more

Q46. N-th Term Of Geometric Progression

Find the N-th term of a Geometric Progression (GP) series given the first term A, the common ratio R, and the term position N.

Explanation:

The general form of a GP series is ...read more

Number and Digits Problem Statement

You are provided with a positive integer N. Your task is to identify all numbers such that the sum of the number and its digits equals N.

Example:

Input:

N = 21

Output:

[15]

Q48. Spiral Order Traversal of a Binary Tree

Given a binary tree with N nodes, your task is to output the Spiral Order traversal of the binary tree.

Input:

The input consists of a single line containing elements of ...read more

Q49. Intersection of Linked List Problem

You are provided with two singly linked lists containing integers, where both lists converge at some node belonging to a third linked list.

Your task is to determine the data...read more

Q50. Minimum Direction Changes Problem Statement

Given a 2D grid with 'N' rows and 'M' columns, where each cell contains a character from the set { 'U', 'L', 'D', 'R' } indicating the allowed direction to move to a ...read more