most common adobe coding interview questions

the 15 most commonly asked adobe interview questions



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.

Copy linked list with arbitrary pointer

Problem statement

Make a deep copy of the given linked list where each node has two pointers: 'next' and 'arbitrary_pointer'.



Connect all siblings

Problem statement

Given the root to a binary tree where each node has an additional pointer called sibling (or next), connect the sibling pointer to the next node in the same level.

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.



String segmentation

Problem statement

Given a dictionary of words and an input string tell whether the input string can be completely segmented into dictionary words.

Find all palindrome substrings

Problem statement

Given a string, find all substrings that are palindromes.


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.




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.



Find the minimum spanning tree



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.

Search in a 2D matrix

Problem Statement

Search, or find the position of, a given key in a 2D matrix. All rows and columns are sorted.

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