Google Interview Questions
- 0of 0 votes
AnswersGiven a list of 2d points, if any two points have distance(straight line) <= k , group them together. For example. [P1,P2,P3], P1 to P2 <=k, P2 to p3<=k, p1 to p3>k. they are still in the same group. (distance relationship is chainable ) ask how many groups can you find ? I can think of N^2 time complexity with union and find. but how to do better than that? maybe NlogN or O(N)?
- laoen November 30, 2019 in United States| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - -1of 1 vote
AnswersGiven a set of horizontal and vertical line segments, find the number of squares formed by them?
- uj.us October 04, 2019 in United States| Report Duplicate | Flag | PURGE
Google Software Engineer - 2of 2 votes
AnswersA mobile phone company wants to deploy network of cell towers to provide good signal coverage for its customers. But it doesn't want to have too many towers because they can interfere with one another. All towers are laid out over a 2-dimensional surface and that towers have same sized circular signal zone. You can determine whether their signal zones will overlap in 0 1) time. Give a parallel algorithm for choosing maximal subset of towers that cover non-overlapping areas.
- MaryJane August 19, 2019 in United States
I was not sure if this can be solved using DP?| Report Duplicate | Flag | PURGE
Google Software Engineer - 1of 1 vote
AnswersCard Game
- acoding167 July 12, 2019 in United States
Card game rule: the hand is drawn from a pack of cards (no jokers).
Play cards ONLY when they are
1. 3 of a kind ('AAA' ) or 4 of a kind('AAAA’).
2. a straight flush of 3 or more cards('JQK' or 'A23456...' in the same suit).
Find out whether the player is able to play the whole hand given.
e.g. [Spade A, Spade K, Spade Q, Diamond Q, Heart Q] return false.
[Spade A, Spade K, Spade Q, Diamond Q, Heart Q, Club Q] return true.| Report Duplicate | Flag | PURGE
Google Software Engineer - 1of 1 vote
AnswersGiven a list L of video names and their watch rates, write a function that will return the videos with the top 10 watch rates. Video names may appear more than once.
- neer.1304 July 03, 2019 in United States
Example:
L = [(‘abc’, 10), (‘def’, 15), (‘ghi’, 10), (‘abc’, 12), …, (‘xyz’, 100)]
The function should return [‘xyz’, ‘abc’, …, ‘def’, ‘ghi’]| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 2of 2 votes
AnswersWrite a function that takes a list L and returns a random sublist of size N of that list. Assume that the indexes must be in increasing order. That is, you cannot go backwards.
- neer.1304 July 03, 2019 in United States
Example:
L = [1, 2, 3, 4, 5]
N = 3
The function should return one of these lists:
[1, 2, 3]
[1, 2, 4]
[1, 2, 5]
[1, 3, 4]
[1, 3, 5]
[1, 4, 5]
[2, 3, 4]
[2, 3, 5]
[2, 4, 5]
[3, 4, 5]| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 0of 0 votes
AnswerConsider an undirected tree with N nodes, numbered from 1 to N. Each node has a label associated with it, which is an integer value. Different nodes can have the same label. Write a function that, given a zero indexed array A of length N, where A[j] is the label value of the (j + 1)-th node in the tree and a zero-indexed array E of length K = (N – 1) * 2 in which the edges of the tree are described, returns the length of the longest path such that all the nodes on that path have the same label. The length is the number of edges in that path.
- neer.1304 July 03, 2019 in United States
Example:
A = [1, 1, 1, 2, 2]
E = [1, 2, 1, 3, 2, 4, 2, 5]
This tree is shown below. A node follows the form label, value.
----------1, 1
-----1, 2 1, 3
2, 4 2, 5
The function should return 2, because the longest path is 2->1->3, and there are 2 edges in this path.
Assume that 1 <= N <= 1000 and each element of the array A is an integer in the range [1, 1000000000].| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 2of 2 votes
AnswersGiven a string A consisting of n characters and a string B consisting of m characters, write a function that will return the number of times A must be stated such that B is a substring of the repeated A. If B can never be a substring, return -1.
- neer.1304 July 03, 2019 in United States
Example:
A = ‘abcd’
B = ‘cdabcdab’
The function should return 3 because after stating A 3 times, getting ‘abcdabcdabcd’, B is now a substring of A.
You can assume that n and m are integers in the range [1, 1000].| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 0of 0 votes
AnswersGiven 1-D list of co-ordinates determine if interval (a,b) is covered
- neer.1304 July 03, 2019 in United States
Ex - [(2,5), (5,7),(1,4)] and interval = (1,6)
return true
Explanation - Points 1 to 6 lies in list of interval given 1 to 4. 2 to 5 and 5 to 7.
[(1,4),(6,7),(2,5)] and interval - (1,6)
return false
Explanation - Distance between 5 to 6 is not covered in the list given so return false| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 0of 0 votes
AnswerCompare two documents(string array) based on n grams.
- neer.1304 July 03, 2019 in United States
e.g doc1 – Today is Sunday.
doc2 – Today is Saturday
if n = 2 then number of duplicates is 1 (Today is)
if n = 1 then number of duplicates is (Today, is)
if n = 3 duplicates is 0| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 0of 0 votes
AnswersGiven a bench with n seats and few people sitting, tell the seat number each time when a new person goes to sit on the bench such that his distance from others is maximum
- neer.1304 July 03, 2019 in United States| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 1of 1 vote
AnswersGiven a room with thief on left side of the room with finite number of sensors. He has to reach on right side missing the sensors. Each sensor is placed at any random point in the room and has its coverage in the radius r. Find out if the thief can reach to the right side without touching the range of any sensor.
- neer.1304 July 03, 2019 in United States| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 2of 2 votes
AnswerGiven an infinite chessboard, find minimum no. of steps for a knight to reach from the origin to (x, y).
- neer.1304 July 03, 2019 in United States
Extension A list of forbidden coordinates are introduced where knight can’t reach. Handle this in your code. Make sure the infinite loop is handled since the board is infinite.| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 0of 0 votes
AnswersGiven a matrix of people(denoted by small alphabets) and bikes(denoted by capital alphabets), find the nearest bike for a given person.
- neer.1304 July 03, 2019 in United States
How will you change your solution if you have to find bikes for a set of people? (assuming multiple bikes can be at the same distance from 1 person)| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 1of 1 vote
AnswersGiven an array of n integers, find the lexicographically smallest subsequence of length k.
- neer.1304 July 03, 2019 in United States| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 1of 1 vote
AnswersGiven a list of player names and their scores – {Carl, 70; Alex, 55; Isla, 40}, design a data structure that can support following modules in optimal time-
- neer.1304 July 03, 2019 in United States
i) updateEntry(string name)
ii) getEntryFromRank(int rank)| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 0of 0 votes
AnswersGiven an input stream of boolean values, design a data structure that can support following modules in optimal time-
- neer.1304 July 03, 2019 in United States
i) setTrue(index)
ii) setFalse(index)
iii) setAllTrue()
iv) setAllFalse()
v) getIndex(index)| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 1of 1 vote
AnswersGiven two strings, A and B, of equal length, find whether it is possible to cut both strings at a common point such that the first part of A and the second part of B form a palindrome.
- neer.1304 July 03, 2019 in United States
Extension1. How would you change your solution if the strings could be cut at any point (not just a common point)?
Extension2. Multiple cuts in the strings (substrings to form a palindrome)? Form a palindrome using a substring from both strings. What is its time complexity?| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 0of 0 votes
AnswersGiven a stream of integers, a value k and a value w, consider the integers in the window w and chop off greater k and smaller k elements from the window w. From the remaining elements, compute the average.
- neer.1304 July 03, 2019 in United States| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 0of 0 votes
AnswersImplement the version control map system which takes the snapshot of the versions of data. Implement the following functions:
- neer.1304 July 03, 2019 in United States
put(key, value) -> puts the value again the key in the latest version of the map
get(key) -> get the value of the key for the latest version of the data
snapshot() -> take a snapshot and increment the version
getValVersion(version id, key) -> return value of the key of the particular version| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 0of 0 votes
AnswerGiven various subsequences of an array, print the overall array:
- neer.1304 July 03, 2019 in United States
Example: [1, 3, 5], [1, 3, 9], [9, 5]
Array : [1, 3, 9, 5]| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 0of 0 votes
AnswerA graph has N vertices numbered from 1 to N. We have two lists. One list M consisted of edges between vertices. The other list K consists of restricted paths. We have to add edges one by one from M and check whether the addition of the particular edge leads to a path between the restricted edges given in K. If it creates a path, we have to discard the edge.
- neer.1304 July 03, 2019 in United States
Example: N = 4; K = {(1, 4)}; M = {(1, 2), (2, 3), (3, 4)}. Here, addition of edge (3, 4) will create a path between 1 and 4. Hence we discard edge (3, 4)| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 0of 0 votes
AnswersYou are given 2 strings which are exactly same but 1 string has an extra character. Find that character.
- neer.1304 July 03, 2019 in United States| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 0of 0 votes
AnswerYou are given an array of million numbers and provided a range of index (say left, right). For multiple queries, each with input left and right indexes, output the maximum in that range.
- neer.1304 July 03, 2019 in United States| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 0of 0 votes
AnswersGiven (x, y) coordinates, create a function such that each coordinate is uniquely mapped to an integer. Also make sure that given an integer, you should be able to find (x, y) coordinates. So F(x, y) = z and also that inverse F(z) = (x, y).
- neer.1304 July 03, 2019 in United States| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 1of 1 vote
AnswerWe have to paint n boards of length {A1, A2…An}. There are k painters available and each takes 1 unit time to paint 1 unit of board. The problem is to find the minimum time to get
- neer.1304 July 03, 2019 in United States
this job done under the constraints that any painter will only paint continuous sections of boards, say board {2, 3, 4} or only board {1} or nothing but not board {2, 4, 5}.
Input : k = 2, A = {10, 10, 10, 10}
Output : 20.
Here we can divide the boards into 2
equal sized partitions, so each painter
gets 20 units of board and the total
time taken is 20.
Input : k = 2, A = {10, 20, 30, 40}
Output : 60.
Here we can divide first 3 boards for
one painter and the last board for
second painter.| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 2of 2 votes
AnswerSelect a random point uniformly within a rectangle, (The side of rectangle is parallel to the x/ y grid).
- acoding167 June 19, 2019 in United States
Follow-up: Given multiple non-overlapped rectangles on the 2D grid, uniformly select a random point from the rectangles.| Report Duplicate | Flag | PURGE
Google Software Engineer - 0of 0 votes
AnswersGiven range of routing numbers, determine which bank it belongs to.
- neer.1304 June 08, 2019 in United States
Ex-
I/p -(123400,123500, BOA), (12538, 12548, GCU)…
For 123450 - Output BOA
12540 - Output GCU| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm - 1of 1 vote
AnswersGiven two two integer arrays. Find the longest common subsequence.
- acoding167 June 02, 2019 in United States
eg: a =[1 5 2 6 3 7], b = [5 6 7 1 2 3]. return [1 2 3] or [5 6 7]| Report Duplicate | Flag | PURGE
Google Software Engineer - 5of 5 votes
AnswersTree Game
- aonecode May 17, 2019 in United States
class TreeNode {
TreeNode parent; //parent node
TreeNode left; //left child
TreeNode right; //right child
}
Two people in a game, player scores by claiming nodes in binary tree, tree node class as shown above.
The player who eventually owns more nodes wins the game.
Player A and B each claims a node at first.
After the first round, a player will only be able to claim a node adjacent to any node owned by himself.
A tree node is adjacent to its parent, left right and right child.
A node owned cannot be re-claimed.
End game when all nodes are owned.
If player A gets the first claim at node N, find whether it is possible for player B to win.
If yes, find out which node player B should claim at his first move.
Follow up: if player B takes the first hand instead, which node should he pick?| Report Duplicate | Flag | PURGE
Google Software Engineer Algorithm
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