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.
4089 solutions
Solution
Optimal Assignments
For this challenge you will be optimally assigning tasks to a number of machines.
481 solutions
Solution
Shortest Path
For this challenge you will have to determine the shortest path from one node to an end node.
1053 solutions
Solution
Pattern Chaser
For this challenge you will be given a string and you will have to determine whether some sort of pattern exists.
701 solutions
Solution
Weighted Path
For this challenge you will have to determine the shortest weighted path from one node to an end node.
336 solutions
Solution
Binary Search Tree LCA
For this challenge you will attempt to find the lowest common ancestor of a binary search tree.
200 solutions
Solution
Gas Station
For this challenge you will be determining whether a car can get around a route with a limited amount of gas.
549 solutions
Solution
Powers of Two
For this challenge you will be determining whether or not a number is a power of two.
7805 solutions
Solution
Parallel Sums
For this challenge you will determine how to properly split an array into two sets.
115 solutions
Solution
Pascals Triangle
For this challenge you will determine the next number in a row from Pascal's triangle.
85 solutions
Solution
Bracket Combinations
This challenge will require knowledge of basic mathematical combinations.
106 solutions
Solution
K Unique Characters
For this challenge you will be searching a string for a particular substring.
355 solutions
Solution
Maximal Square
For this challenge you will be searching a matrix for the largest square submatrix.
43 solutions
Solution
Maximal Rectangle
For this challenge you will be searching a matrix for the largest rectangle submatrix.
32 solutions
Solution
Symmetric Tree
For this challenge you will traverse a binary tree and determine if it is symmetric.
227 solutions
Solution
Binary Tree LCA
For this challenge you will attempt to find the lowest common ancestor of a binary tree.
112 solutions
Solution
Other Products
For this challenge you will return the product of a set of elements in an array.
1454 solutions
Solution
Wave Sorting
For this challenge you will determine if numbers in an array can be sorted in a particular way.
961 solutions
Solution
Tree Constructor
For this challenge you will determine if an array of integer pairs can form a binary tree properly.
126 solutions
Solution
Longest Increasing Sequence
For this challenge you will compute the length of the longest increasing subsequence.
925 solutions
Solution
Power Set Count
For this challenge you will determine the length of a power set.
840 solutions
Solution
Word Split
For this challenge you will attempt to split a long string of characters into actual words.
283 solutions
Solution
Palindromic Substring
For this challenge you will be finding the longest palindromic substring.
187 solutions
Solution
Bipartite Matching
For this challenge you will be finding the maximum cardinality matching of a bipartite graph.
30 solutions
Solution
Trapping Water
For this challenge you will determine the largest amount of water you can trap within a boundary.
110 solutions
Solution
Matrix Path
For this challenge you will determine if a path exists in a boolean matrix.
61 solutions
Solution
Seating Students
For this challenge you will determine how many different ways students can sit next to each other.
115 solutions
Solution
Longest Matrix Path
For this challenge you will be searching for the longest path in a 2D matrix.
45 solutions
Solution
Food Distribution
For this challenge you will determine how to optimally distribute food to people.
449 solutions
Solution
Min Window Substring
For this challenge you will be searching for the optimal substring of k characters.
111 solutions
Solution
City Traffic
For this challenge you will be finding the maximum traffic that will enter a node.
28 solutions
Solution
Correct Path
For this challenge you will be traversing a matrix searching for the correct path to take.
615 solutions
Solution
Three Points
For this challenge you will be plotting a line on a Cartesian grid.
81 solutions
Solution
Longest Consecutive
For this challenge you will compute the length of the longest consecutive subsequence.
213 solutions
Solution
String Periods
For this challenge you will need to find the smallest repeating substring.
260 solutions
Solution
Wildcard Characters
For this challenge you will determine if a string matches a set of wildcard characters.
44 solutions
Solution
Plus Minus
For this challenge you will need to determine how to add or subtract numbers to end up with zero.
65 solutions
Solution