Google Interview QuestionsStudy programming and algorithm questions
Find the middle element of a linked list
Method to find the middle element of a linked list in linear time.
Two sum problem
A popular interview question that requires you to determine if two numbers in an array sum to a specific value. A solution can be written that runs in linear time.
Print the power set of a given set
Solution for printing all possible subsets of a given set.
Subset sum problem
Important computer science question where the goal is to find a subset that sums to some number.
Determine if a tree is a subtree of a larger binary tree
Use tree traversal algorithms to solve this tree algorithm question.
Generate all balanced bracket combinations
Interesting question that asks you to print all combinations of pairs of brackets.
Find all string combinations of only 0, 1 and ?
Print all possible strings of 0's and 1's where the ? is a wildcard.
Insert an interval into a list of sorted disjoint intervals
Solution for inserting an interval into an already sorted list of disjoint intervals.
Implement a queue using two stacks
Solution for how to implement a queue using the stack data structure.
Counting steps using recursion
Recursion is an important topic to understand when learning a language, so this tutorial provides a simple example.
Stock maximum profit
Solution that explains how to calculate the maxiumum profit that could be made in a list of stock prices.
Quickly calculate the cube root of a number
Algorithm to calculate the cube root of a given number in constant time.
Array Addition
For this challenge you will determine if numbers in an array can add up to a certain number in the array.
3792 solutions
Solution
Binary Search Tree LCA
For this challenge you will attempt to find the lowest common ancestor of a binary search tree.
150 solutions
Solution
Bracket Combinations
This challenge will require knowledge of basic mathematical combinations.
88 solutions
Solution
Counting Anagrams
For this challenge you will determine how many anagrams exist in a string.
111 solutions
Solution
K Unique Characters
For this challenge you will be searching a string for a particular substring.
271 solutions
Solution
Maximal Rectangle
For this challenge you will be searching a matrix for the largest rectangle submatrix.
27 solutions
Solution
Symmetric Tree
For this challenge you will traverse a binary tree and determine if it is symmetric.
158 solutions
Solution
Binary Tree LCA
For this challenge you will attempt to find the lowest common ancestor of a binary tree.
79 solutions
Solution
Wave Sorting
For this challenge you will determine if numbers in an array can be sorted in a particular way.
681 solutions
Solution
Tree Constructor
For this challenge you will determine if an array of integer pairs can form a binary tree properly.
86 solutions
Solution
Longest Increasing Sequence
For this challenge you will compute the length of the longest increasing subsequence.
615 solutions
Solution
Power Set Count
For this challenge you will determine the length of a power set.
574 solutions
Solution
Word Split
For this challenge you will attempt to split a long string of characters into actual words.
199 solutions
Solution
City Traffic
For this challenge you will be finding the maximum traffic that will enter a node.
20 solutions
Solution