CareerCup

You have to implement the following function:
int MinColoring(int k, char* str);int MinColoring(int k, char* str);static int MinColoring(int k, String str) {}static int MinColoring(int k, string str) {}
The function takes a string 'str' of size 'n' and an integer 'k' as its arguments and returns the minimum no. of paint operation required to achieve the final colored sequence as represented by 'str'.
A paint operation is defined as coloring exactly 'k' consecutive balls out of 'n' balls with a single color.
Assumptions:
n > 0
0 < k <= n
Note:
Paint operation always starts from the ball at index 0
Any ball can be repainted any no. of times
Each character in 'str', represented by small letter alphabets, denotes the final coloring of the ball at that index
If the colored sequence cannot be obtained by any no. of paint operations, return -1
Paint operation can not be performed for less than 'k' balls

Example:
Input:
k: 3
str: rrggg
Output:
2
Explanation:
Since we can color 3 balls at a time, we can first color the balls {0, 1, 2} with color "r". Next, we can color the balls {2, 3, 4} with color "g". As a result, color sequence of the ball will be rrggg. And this was achieved in 2 paint operations.

Design a task execution service, which accepts tasks from clients and runs them and returns result. Following is how the

Client Registration (client name, callback method)
Submit Job to service
Once executed service will return the result to client

Lets assume that 20k jobs are getting submitted per second, you need to scale it in such a way that we are able to process as much jobs per second as possible.

Further questions:

So the components are going to be a load balancer, workstations, cache, task runner and DB. How will you make sure that data is consistent among them, mimimal duplication of data and every job is ran only once.

If any machine is down, say DB, workstation etc. how that is going to be handled.

Developing Java game
creating a RESTful service using which players can play a simple game described
below.
The game should have the following rules:
• The player has an infinite amount of coins.
• The player bets 10 coins to play a normal game round.
• In any round (free or normal), the player has a 30% chance of winning back 20 coins.
• In any round (free or normal), the player also has a 10% chance of triggering a free round where
the player does not have to pay for bet. The free round works in the same way as a normal round except
it costs 0 coins. The free round should follow immediately after the normal round.
• The player can both win coins and free round at the same time.

I participated interview event with Amazon and receive email from Amazon recruiter that the team was happy with my performance and would be giving me offer at Amazon Vancouver Office, Canada. However,17 days later i still not get an official offer. I did several follow up with the recruiter within the period, just to get some "they are finding team for me" response. What could go wrong? Why is it in my case that the offer is being process so slow?

I have a service in Which you need to send below data in SMS with a keyword and in return you will get the availability of flight or you can book a seat in flight.

Data - AirlineName, Date, Time, From, To

1. Give Test Data
2. Give Test Scenarios

3. If you have not being given any Mobile phone to send text or any API client to query the webservice, how will you test this?

I have clicked some photos in a Camera. I am trying to transfer photos to laptop using USB cable but the Camera is not getting connected. Give debugging steps.

Write a Java code that take a string of parenthesis as input and return if the string is valid or not . The input will have '(' and ')' and also '*' and * serves as wild card and can be used in place of both '(' and ')' or it can be null.

For example,the String (*)(*)(** is a valid String.

Follow up: What if '[]' and '{}' are also in the string along with '()' and * can be used in place of any of them or can be considered as null?

Find the indices of all anagrams of a given word in a another word.
For example: Find the indices of all the anagrams of AB in ABCDBACDAB (Answer: 0, 4, 8)

All jumbled numbers of n digits in max (worst case) O(n) and min (avg case) O(log n) time.

A number is a jumbled number if the _absolute_ difference between adjacent digits is <=1.
For an input n=3
output should be
100
101
110
111
121
122
...
and so on.

The problem is similar to the one listed here https://www.careercup.com/question?id=5729332770111488

But this problem also has a O(n or log n) limitation and the solutions listed in the above mentioned problem at the time of posting this question, do not satisfy the criteria

PS: 001 is not a 3 digit number.
210 is absolutely fine as the absolute difference between adjacent digits is <=1.

How to Design Netflix.(System Design)

How to Design App-Store like google play.(System Design)

How to design a Debugger both HLD and LLD?

You are given a stream of numbers which represent the stock prices of a company with timestamp. You need to perform some set of operations on the stream of data efficiently as below: 1. findStockPriceAtGivenTimeStamp(Timestamp) 2. deleteAndGetMinimumStockPriceForToday() Timstamp: 1 2 3 . 4 . 5 Prices: 12 34 4 . 1 . 18

Design online multiplayer generic board game (like chess). How will you store sessions.(RDBMS or REDIS) How will the
competitor be chosen and notified(HTTP or what?).
What are the appropriate classes?

Design Recommendation system. How will you generate generate recommendations for millions of users. DB Schema, How will you improve latency? if the user is searching a item, when will you show next recommendations. How will you update, latency basically and consistency.

You are provided with 2D char array. You have to provide the 2D char array as response which contains the multiplication od the input array. For eg: input=> {{a,b},{c,d}}, output => {{a,c},{a,d},{b,c},{b,d}}

You are provided with different Excel files and the data format those files contain. You are also provided with low level parser. You have to design a system which takes the excel file and its data type as the input and returns the list of Data objects in the file.

Design JProfiler. How will you design datastructure and why, function stacktrace. HLD+LLD

Design a Fresh Grocery System. Means Daily usable Items, you cannot store them in inventory like bread, milk etc.
HLD+ DB Schema + Concurrency issues + Scalable architecture. How will you scale to multiple countries

How to develop a web based multiplayer chess game. There will be 2 player in each session. There will be multiple sessions.

My answer(I was not selected)
Each player will have a database with columns
user id(primary key), passwd,no of games played, won,drawn,last active time,sq1,sq2,...sq64,move made flag,pawn num, sqstart,sqend
where sq1-denotes square 1 and its value represents the pawn num in sq1
question- what all fields in database will be encrypted
answer-passwd
question- why not others
answer-may be system admin needs to access them
question – how will u start a session between players?
Answer-When a player logs in, his last active time is updated. Each player is shown a list of last active players to chose from.Or system can arbitrarily select one.When a player is selected, he gets a request. Each player receives a list of requests from other players. He choses from one. That player gets an acknowledgement others get negative acknowledgement. If acknowledgement does not come in time then that player is dropped and another player is selected.
Question- http connection, can not send request from server. How the 2 players will send request to each other and how session will be initiated?
Question-how the game will be stored?
The 64 squares sq1,sq2,..sq64 will each store the pawn number in them. From random number calculatio, it will be decided which one is white and which one is black 1st time. When a player makes move,has made move flag will be true. The last move is stored as sqstart,sqend,pawn number. Each time a move is made check for valid move.The other player continuously polls for has made move flag to know if it is his turn
remarks- ur design is not scalable.

You are given a Log that contains UserId, ProcessId, Start Time, End Time and Resource Consumption during that time, you need to find out the user who has utilized the most resources.

Example:

UID    PID    StartTime    EndTime     Consumption

1        1        200       300             100

2        2        230       340             80

1        3        245       315             50

1        4        305       330             20

Time 200 signifies: 02:00.


Output: UID# 1
UserID 1 because he has consumed the most number of resources between 200 to 315 (Resource Consumption: 150).

Design an order tracking system using the below constraints.

Once an order is received, it will be assigned to a delivery boy and sends notification at every stage of the order such as order received with expected time of delivery, delivery boy assigned, order picked up, order delivered.

State how your design will help scale and what will be the performance SLAs that will you will set for your design. The system should be able to horizontally scalable from hundreds of orders to million orders and should perform at almost the same level irrespective of the number of orders received.

Add a digit to a number that is represented by a linked list, where each node is a digit of the number. The linked list couldn’t be modified, except the digits to be modified in answer and the number could be infinitely long. Need to do it in O(1) space.

Find the Minimum length Unsorted Subarray, sorting which makes the complete array sorted

Maximum difference between node and its ancestor in Binary Tree in O(n) time.

Given MxN binary matrix, find the largest sub-square matrix with all 1’s.

Design a geographically partitioned multi-player card game, that supports multiple players, multiple games at a time.
Each game will have one contractor like ones we have in a bar, He can play a game or just watch it. Integrate payment systems.
First HLD was required, use cases, flow diagram. then a low level design was required all necessary classes where will you use polymorphism, where inheritance, multithreading, synchronised approach if needed, socket connections

Design a Netflix type system. Start from HLD to LLD.
Consider requirements like search, video serving, authentication, security, serving multi quality video.

Given an array of integers. We need to answer two types of queries point update and range sum in minimum time.

Put the given random pointers in linkedlist to point to next greater node such that if you transverse the list using random pointers, list become sorted. duplicates are allowed.