most common adobe coding interview questions

the 15 most commonly asked adobe interview questions

For detailed solutions to each question, you can visit
Grokking the Coding Interview: Patterns for Coding Questions

 

Arrays

Determine if the sum of three integers is equal to the given value

Problem statement

Given an array of integers and a value, determine if there are any three integers in the array whose sum equals the given value.

Find the missing number in the array

Problem statement

We are given an array containing ‘n’ distinct numbers taken from the range 0 to ‘n’. Since the array has only ‘n’ numbers out of the total ‘n+1’ numbers, find the missing number.

 

linked lists

Add two integers

Problem statement

Given the head pointers of two linked lists where each linked list represents an integer number (each node is a digit), add them and return the resulting linked list.

Determine if the linked list has a cycle

Problem statement

Given the head of a singly linked list, write a function to determine if the linked list has a cycle in it or not.

 

trees

Given a binary tree, perform a zigzag level order traversal

Problem statement

Given a binary tree, populate an array to represent its zigzag level order traversal. You should populate the values of all nodes of the first level from left to right, then right to left for the next level and keep alternating in the same manner for the following levels.

Determine if the binary tree is a binary search tree

Problem statement

Given a Binary Tree, figure out whether it's a Binary Search Tree. In a binary search tree, each node's key value is smaller than the key value of all nodes in the right subtree, and are greater than the key values of all nodes in the left subtree i.e. L < N < R.

 

strings

Longest substring with no repeating characters

Problem Statement

Given a string, find the length of the longest substring which has no repeating characters.

Longest substring with at most 'k' distinct characters

Problem statement

Given a string, find the length of the longest substring in it with no more than K distinct characters.

 

dynamic programming

find the maximum sum of a subarray

Problem Statement

Given an array of positive numbers and a positive number ‘k’, find the maximum sum of any contiguous subarray of size ‘k’.

 

Math and stats

Determine if the number is valid

Problem Statement

Given an input string, determine if it makes a valid number or not. For simplicity, assume that white spaces are not present in the input.

 

backtracking

boggle

Problem Statement

Given an NxN grid of characters and a dictionary, find all words which can be made from the characters in the grid and are present in the given dictionary. A word can start and end at any character in the grid. The next character must be adjacent to the previous character in any of the directions i.e. up, down, left, right and diagonal. The character at each position in the grid can be used only once while making a word.

 

Graphs

find the minimum spanning tree

 

design

implement a lru cache

Problem Statement

Least Recently Used (LRU) is a common caching strategy. It defines the policy to evict elements from the cache to make room for new elements when the cache is full, meaning it discards the least recently used items first.

 

sorting and searching

merge overlapping intervals

Problem Statement

Given a list of intervals, merge all the overlapping intervals to produce a list that has only mutually exclusive intervals.

find the ceiling of a number

Problem Statement

Given an array of numbers sorted in an ascending order, find the ceiling of a given number ‘key’. The ceiling of the ‘key’ will be the smallest element in the given array greater than or equal to the ‘key’. Write a function to return the index of the ceiling of the ‘key’. If there isn’t any ceiling return -1.

For detailed solutions to each question, you can visit
Grokking the Coding Interview: Patterns for Coding Questions

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