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Given 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)?

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what happens when 2 global semaphores are acquiring the lock at the same time.

How to reserve a seat on Southwest airlines flight?

Find the first N words with the highest frequency in an array of strings. The result needs to be sorted by frequency.

For example:

An array of String:

Inputs:

{"geeks", "for", "geeks", "a", "portal", "to", "learn", "can", "be", "computer", "science", "zoom", "yup", "fire", "in", "be", "data", "geeks"}

and the first 2 words with the highest frequency.

Outputs: {'geek", "be"}

where "geek" has a frequency of 3 and "be" has a frequency of 2.

My name is Bessie Lynch from Alaska. The cash app is revolutionizing the way of money transfer. cash app customer service the USA provides you an easy interface to customers transfer money to another account just sending an email.

Given someone's favorite songs (as a map) and a genre category (as a map as well). Find out this person's most favorite genre. For example,

"David": ["song1", "song2", "song3", "song4", "song8"],
"Emma": ["song5", "song6", "song7"]

and

"Rock": ["song1", "song3"],
"Dubstep": ["song7"],
"Techno": ["song2", "song4"],
"Pop": ["song5", "song6"],
"Jazz": ["song8", "song9"]

Output:

"David": "Rock"
"Emma": "Pop"

Given a list of a string which is a list of words separated by a space. Sort the list in the lexicographical order. For example, given the followings:

[act car]
[air dog]
[act zoo]

Result:

[act car]
[act zoo]
[air dog]

Write a binary calculator for summing two strings. Could not use standard {{ bin }} method.

two sum

reverse an array for k distance.
[2,3,1,5,4] and k =3
output : [2,3,1,5,4]
method
void reverse(int[] arr, k)

this method will only reverse the array

write another method which will sort the array by incorporating reverse method inside sort.

You must have to call reverse(arr,k) method to sort the array. You are not allowed to modify the reverse method

Two sum problem

Prepare test plan for a new feature of " deposit cheque via mobile app " which is added under menu tab.

Write a function to return string when passed integer . Note : do not use tostring() in built function.

E.g 123 --> "123"

write a program for recognize the string (a/b)*abb

A new senior trader has been invited to a gathering of traders from all around London. She goes there and tries to meet as many traders as she can. When she meets someone she generally remembers them by the market sector they deal in.
36 traders deal in the fx market.
32 traders deal in the derivative market.
39 traders deal in the crude oil market.
37 traders deal in only one market.
8 traders deal in all the three markets.
All traders deal in atleast one of the three markets.
Number of traders who deal in both derivative and crude oil but not fx was one less than the number of traders who deal in both fx and derivative but not crude oil.
The sum of the number of traders who deal in both fx and crude oil but not in derivative and in both crude oil and derivative but not fx was two greater than twice the number of traders who deal in both fx and derivative but not crude oil.

How many traders deal in both fx and crude oil but not derivative?


Find someone who has solved the first half of their collaboration question and ask them for the solution they got. You both have to solve the below question together and then come to us with your solution.
Let x be your result and y be the result for your partner
Then, P = (10* x/2)+ floor(y/4). Use p as an input to the next question.


According to the recent report published by the Human Resource team at a FinTech startup, the number of employees is 500 at present. They have been divided into four teams, named Technology, Operations, Management and Legal.
The report also tells that out of these employees, P% are campus recruits while the remaining have prior work experience. The number of employees in each team can be no less than 50 and no more than 175.
The following partially filled table shows the information about the break-up of the employees in terms of campus recruits or with work experience in the four teams.
Team Campus Recruit Work Experience
Technology 55% -
Operations - 45%
Management 55% -
Legal m% n%

What can be said about the relative values of ‘m’ and ‘n’?
a. m>n b. m<n c. m>=n d. m<=n

Was asked at the Grace Hopper Celebration India (Bangalore) career fair at the GS booth.

How many golf balls are going to fit in the Boeing manufacturing warehouse?

My response:
Estimation problem, volume of the warehouse is approx 13.5*10^5 m^3 and vol. of each golf ball is 4/3*3.14*0.002^3 The space between every 8 golf balls is ~ equal to 1 golf ball...

Was asked at GHCI Bangalore at their booth for a prize and perhaps hiring interns or experienced software developers.

Find the return value for N=100

int returnAns(int N){
int ans=0;
for(int i=0; i<N; i++){
for(int j=i+1; j<N; j++){
ans +=((i & -i) == (j & -j)?1:0); //the question missed the condition and was returning a boolean, so I added it myself
}
}
return ans;
}

My answer: 0 ; their answer: 1610, hence got it wrong.
My explanation: I assumed negative of i in binary to be
simply represented by setting the MSB to 1 e.g. for 8 bit representation of 3: +3 is 0000 0011 and -3 is 1000 0011. In the inner loop the value of ans will always evaluate to 0 since Bitwise & of these i and -i or j and -j will always result into i and j respectively. (undergrad computer organization concept.)
Negative numbers can also be represented as 1s and 2's complement and in all modern machines by architecture its 2s complement.
Now if we assume 1's complement, +3: 0000 0011 and -3: 1111 1100. so bitwise & of these two is 0 and so the value of ans will always be incremented by 1. By two loops 100+99+98+97+...+1 = 100*101/2 (i.e. n*(n+1)/2)
Then 2's complement, which is the most relevant representation of signed binary numbers.
Odd numbers:
+3: 0000 0011 -3: 1111 1101 Binary & is 0000 0001.
For all even numbers:
+4: 0000 0100 and -4: 1111 1011+0000 0001 = 1111 1100 and Bitwise & of 4 and -4 is 0000 0100 which is 4.
So, in the innermost loop ans is incremented by 1 when i is odd and j is also odd. ie. when i is 1, 3, 5, 7... 97 and j is 3, 5, 7, 9,...,99 ans is added 1(return value of true ==) when calculated it comes to 1610.

ten years ago, Delhi Metro started its operation by opening the first line in central Delhi. The government received enormous response from various sections of society of Delhi. People started using Metro services so often that only after 6 months all the train coaches filled tightly by the travelers. After 10 years now, Metro expanded so much that now it covers almost all the major areas of the city. Today around 6 different lines are running in different areas which are connecting not only Delhi but also other NCR regions to Delhi. Lakhs of people using Metro service every day and today it becomes one of the top 10 well known Metro networks all over the world. For this new line, Metro Planning team found various localities where metro stations can be built and they identified various Localities around Delhi where commercial agreements are established. Goods were traded between localities via road that had a commercial agreement. It is possible to connect any two localities by a line segment in the city.

There are N cars parked in a row in a parking lot of the newly  constructed club. as it is demonstrated in the picture below.




 

There is a gasoline and diesel fueling station installed.at the left and right side of the park.
An automatic fueling robot carries the fuel from station and fill up the parked car with fuel.
The cars are divided into 2 types depending on whether it is a gasoline or diesel car.
1 is denoted as gasoline cars and 2 is denoted as diesel cars.

The automatic robot will be used to provide a cost free fueling service which is filling up
 all cars with 1 litre of each corresponding fuel.
The robot will move in between the 2 fuelling stations as below :
  1) The robot carries 2 litre of gasoline at the gasoline station and starts moving from there.
 2) The robot can fill up the cars of the same type of gas it carries 1 litre each.
 3) The robot can go back to the fuelling station at any time, Independent from the current amount of fuel it carries.
 4) When the robot arrives at the fuelling station, it gets 2 litre of supply of the corresponding fuel.(If the robot has some remaining fuel it will be discarded).

the picture is not there. so, i will explain how the arrary must look like. suppose the arrary is arr od
size x. then at index = 0, there is gas station and at index = x - 1 there is dielsel station. Remaining all indexes are filled with vehicle type. 1 represents gas type and 2 represents diesel type.

I was asked this during my onsite google interview but was unable to come up with an optimization for it. Here is the question:

There's a list of (x,y) points and a method getCircle with the following signature:

/**
* Given three points returns a circle (Radius, and center) such that all three points lie in its circumference
* or it returns null if no such circle is possible.
*/
Circle getCircle(point1, point2, point3);
getCircle method is already implemented and given to you as a black box. The problems asks you to find the Circle with most points in its perimeter.

The obvious answer is to get all possible triplets of points and find all possible circles and keep track of which one appears most often O(n^3) . Any ideas on how to further optimize this?

How to book a seat on Southwest airlines flight

You have a table :
Rule1 Rule2 Rule3 Value
A1 B2 C3 40
A1 B1 C1 20
A2 B2 C2 10
A1 B1 C1 40
* B1 * 20
A5 B2 * 10

Now if I have a condition A1 && B2 && C3 i will get output as 40.
If I input A1 && B1 && C1 I will get two results 40 and 20 here there the rule is ambiguous.
"-" in table means any rule, 5th row matches with any row with B1 as rule2, so there is also ambiguity in result.

Now given that table as input (m * n) where n is number of available rules combination (here its 6) and m rules (3 in this case) , output if the table is ambiguous i.e it will output two different result for same query.

Find the two elements that have the smallest difference in a given array.

Write an iterator class to traverse the tree

How to traverse a tree?

Giving a the following:

A list of a store items T={t_1, t_2,...,t_n}.

A list of prices of each item P={p_1, p_2,...,p_n}.

A list of quantities of each item Q={q_1, q_2,...,q_n}, respectively.

And total bill M.

Our goal is to find any possible list of items that its total value is equal to M using dynamic problem.

Write down a recursive solution.

How do you manage a rate card system. On what all parameters should you be considered while creating a rate card for the seller while shipping a product.

Given an array of positive and negative integers {-1,6,9,-4,-10,-9,8,8,4} (repetition allowed) sort the array in a way such that the starting from a positive number, the elements should be arranged as one positive and one negative element maintaining insertion order. First element should be starting from positive integer and the resultant array should look like {6,-1,9,-4,8,-10,8,-9,4}