CareerCup

Design a voting system. 100M users will be logging in within a window of 24h (not necessarily uniformly). Every user will be able to choose from a fixed list of options. If the user has already voted the system should not let them to vote a second time. Additional constraint: only the first 100K votes are accepted. If the quota is exceeded any attempt to vote should be rejected.

A special palindrome is a palindrome of size N which contains atmost K distinct characters such that any prefix between the size 2 to N-1 is not a palindrome.
You need to count the number of special palindromes
For example, abba is a special palindrome with N=4 and K=2 and ababa is not a special palindrome because aba is a palindrome and its a prefix of ababa.
If N=3, K=3, possible special palindromes are aba, aca, bab, bcb, cac and cbc. So answer will be 6.

Input format
Two integers N and K

Output format
Answer modulo 10^9+9

Constraints
1<=N,K<=10^9

Sample TC
3 3

Output
6

Given a length n, count the number of strings of length n that can be made using ‘a’, ‘b’ and ‘c’ with at-most one ‘b’ and two ‘c’s allowed.

Next Sunday is Ayan’s 4th birthday and a lot of guests are invited for his birthday celebration. All of them are getting gifts for Ayan and his y-1 number of siblings. There are x number of guests coming to the party and each of them presented each kid some integer number of gifts (possibly zero). The guests are numbered with integers from 1 to x and all kids are numbered with integers from 1 to y. For all 1 ≤i ≤x the minimum number of gifts, which i-th guest presented to some kid is equal to gi and for all 1 ≤j ≤y the maximum number of gifts, which j-th kid received from some guest is equal to kj.

Let ai,j be the number of gifts which the i-th guest give to the j-th kid. Then gi is equal exactly to the minimum among values ai,1,ai,2,…,ai,y and kj is equal exactly to the maximum among values g1,j,g2,j,…,gx,j.



You are interested in the minimum total number of gifts that guests could present, so you need to minimize the sum of ai,j for all (i,j) such that 1 ≤i ≤x and 1 ≤j ≤y. You are given the numbers g1,…,gx and k1,…,ky, determine this number.

Input Format

The first line contains two integers x and y, separated with space — the number of guests and kids, respectively (2≤x,y≤100000). The second line contains x integers g1,…,gx, separated by spaces — gi is equal to the minimum number of gifts, which i-th guest presented to some kid (0≤gi≤1000). The third line contains y integers k1,…,ky, separated by spaces — kj is equal to the maximum number of gifts, which j-th kid received from some guest (0≤kj≤1000).

Output Format

If the described situation is impossible, print −1. In another case, print the minimum total number of gifts, which guests could have presented and all conditions could have satisfied.

Sample Input

3 2

1 2 1

3 4

Sample Output

12

Mr. Stark is the owner of Stark industries, a manufacturer of weaponry.

A local Mafia group has hijacked one of the factories in the desert.

The mafias want to transport the weapons from the factory to their base camp, and use a single truck to do it.

But, every kilometer the truck travels with the weapons, one weapon falls off and breaks. The truck can only travel integral values of distance, and will lose 1 weapon for every km travelled.

The weapons can be unloaded at any point from the truck, and can be picked up again later.

Given the number of weapons X, max capacity of the truck Y and distance between the factory and the base Z, find the maximum number of weapons that can be transferred intact from the factory to the mafia base.



Function Description:

findMaxWeapons function takes the following parameters:

X - the number of weapons

Y - max capacity of the truck

Z - distance between the factory and the base

you are given string of digits, a value x and N. you have to divide that string in ((i-1)*x+1,min(i*x)) parts.

for example a String is ="1234567891" and x=5,N=10 then

there will be 2 partition of string since x=5
[12345] end [67891]

you have to find kth min number from these combinations. for example k=3 then ans should be 17

combination will happen like every digit from 1st partition will concanate with other partition digits

so if there were three partition for string 123456789 then it could be like

[123][456][789]

and if k=3 then ans would be 149

recently I came across one good design question. I need your thoughts how to proceed. Assume a big IT hub, like any co-work space / Microsoft / amazxon/ google etc office (which has multiple floors , each floor has multiple meeting rooms , work stations etc) . At any point of time , an admin should be able to know 1. how many people are there in that facility 2. How many people at each floor wise 3. If he chooses any cons room, he must be able to fetch how many people in that conf room at that time . This normally used for any kind of evacuation etc

I tried with http protocol , but interviewer said http is over kill , he hints on some IoT communication etc .. however , want to know what is the best way to solve it

A string can contain only a, b or c. There cannot be 2 consecutive same character. First and the last character cannot be the same. Now given a string with ‘a’, ‘b’, ‘c’ or ‘?’. We need to find the string replacing ‘?’ that satisfy the above conditions. For multiple-answer display lexicographically smallest string. For no answer possible display “Not Possible”.

repeat string n^n times without using extra space

Design and implement rate limiter for limiting api calls for a service distributed multiple users.

Design data structures which support millions of products coming in streaming manner, we need to find at any moment what are top n products at any day

You run a linux binary provided by a customer and don’t get any output. The customer assures you it should provide output. You don’t have the source code for this binary. How would you debug this? What tools / techniques can you use ? *

A customer raises a support ticket as they have a serious situation which has caused them data loss. You determine the issue is a bug in the product which is already fixed in a later version. Please write a response to the customer support ticket.

As you know, most Operating Systems are written in Java, what’s special about pointers in Java ? *

How would I store 100 million documents (~40 Gigabytes) in 32 Gigabytes of RAM? The documents are in JSON format. In other words how do couchbase, redis, and mongodb work in memory?

A co-ordinate plane was given. On each point (x, y) there are x+y number of apples on it. A person is standing on (0, 0) and he wants to buy a square plot having N number of apples inside it (including the periphery). Question was to return the value of perimeter of that square plot given N.

A dictionary is combination of characters from a-z. let's say a=1,b=2.. and so on z=26. you are given n and k. you have to find sum of length k from given combination.
for example n=51 and k=3 then your answer should be =axz
as there can be many combination for given sum so it is suggested to print those string which comes first in dictonary

beautiful numbers are those numbers which contains digit only 4 and 5 also they are palindrome.length of number can't be odd. for example
44,55,4554 are beautiful numbers where as 38, 444 are not.
your task is to find nth number in this series. let's say if n=4 then output should be 4554. for n=1 output will be 44 always.

A 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.

I was not sure if this can be solved using DP?

What data structure will you use to suggest friends in FB

If ads were removed from YouTube, how would you monetize it?--Associate account strategist, January 2016

Implement auto complete for IDE, you will be given strings of classes and input, input can be like MVC, MoClick, MouseClickHand
For MouseClickH => MouseClickHandler

MVC => can match to any classes where first word starts from M then V then C

A stream of data representing the price of a commodity is being read. The data is of the format (price:Int, timestamp:Option[Long]).
If the timestamp is missing, it means the price has to be deleted.
If timestamp is old, it means the previous data with same timestamp has to be updated with this new price.
Else it's the new price of the commodity.
At any point of time the latest, max and min of the price has to be printed.
If the delete instruction is received through the stream, the min/max should be updated accordingly.

select b.dname,sum(sal) from dept b right join emp a ON (a.deptno=b.deptno)group by deptno from emp a ;

There are N stations in a certain region, numbered 1 through N. It takes di,j minutes to travel from Station i to Station j (1 ¥leq i, j ¥leq N)$. Note that di,j=dj,i may not hold.
You are now at Station 1. From here, you have to visit all the stations exactly once. We assume that you have already visited Station 1. However, due to your schedule, there are M restrictions that must be satisfied. The format of each restriction is as follows:
• Station si must be visited before Station ti. (1≤i≤M)
Find the minimum time required to visit all the stations. Note that the last station to visit can be any of the stations.
Constraints
• 1≤N≤14
• 0≤di,j≤108 (1≤i,j≤N)
• di,i=0 (1≤i≤N)
• 0≤M≤N(N−1)⁄2
• 1≤si,ti≤N (1≤i≤M)
• si≠ti (1≤i≤M)
• There exists a path visiting all the stations under the given restrictions.
Input
Input is given from Standard Input in the following format: N d1,1 … d1,N : dN,1 … dN,N M s1 t1 : sM tM
Output
Print the minimum time required to visit all the stations.
Sample Input 1
4
0 2 3 4
1 0 3 4
1 2 0 4
1 2 3 0
3
1 2
2 3
3 4
Sample Output 1
9
Due to the restrictions, we can only travel as follows: Station 1 → Station 2 → Station 3 → Station 4. Thus, the answer is 2+3+4=9 and we should print 9.
Sample Input 2
3
0 1 20
1 0 20
10 20 0
0
Sample Output 2
21

You are given an array of length N consisting of integers, a={a1,…,aN}, and an integer L.
Consider the following subproblem:
• You are given an integer S.
• Find the largest value in the interval [S,S+L−1] in the sequence a, that is, find max(aS,…,aS+L−1).
Solve this subproblem for every S=1,…,N−L+1.
Constraints
• 1≤N≤105
• 1≤L≤N
• −109≤ai≤109
Input
Input is given from Standard Input in the following format: N L a1 … aN
Output
Print the answers in N−L+1 lines. The i-th line should contain the answer to the subproblem where S=i.
Sample Input 1
5 3
3 4 2 1 5
Sample Output 1
4
4
5
• The subproblem where S=1 asks the largest value among a={a1,a2,a3}={3,4,2}, so the first line in the output should contain 4.
• The subproblem where S=2 asks the largest value among a={a2,a3,a4}={4,2,1}, so the second line in the output should contain 4.
• The subproblem where S=3 asks the largest value among a={a3,a4,a5}={2,1,5}, so the third line in the output should contain 5.
Sample Input 2
4 1
-1000000000 1000000000 -1000000000 1000000000
Sample Output 2
-1000000000
1000000000
-1000000000
1000000000

There are N rooms in a row. The i-th room (1≤i≤N) from the left is called Room i. You are given M closed intervals [ai,bi] (1≤i≤M). At time 0, all rooms j such that ai≤j≤bi for some i (1≤i≤M) are occupied, and the other rooms are vacant.
You are given Q queries. The i-th query (1≤i≤Q) represents an event happening at time i, as follows:
• In the i-th query (1≤i≤Q), a closed interval [ci,di] (1≤i≤Q) is given.
• This query asks: "Are all rooms j such that ci≤j≤ci" vacant?
• If all those rooms are vacant, the query should be responded by OK, then all rooms j such that ci≤j≤ci get occupied.
• Otherwise, the query should be responded by OK, then nothing happens.
Process these queries.
Constraints
• 1≤N≤109
• 0≤M≤1000
• 1≤ai≤bi≤N (1≤i≤M)
• There are no rooms k such that ai≤k≤bi and aj≤k≤bj at the same time (1≤i<j≤M).
• 1≤Q≤1000
• 1≤ci≤di≤N
Input
Input is given from Standard Input in the following format: N M a1 b1 : aM bM Q c1 d1 : cQ dQ
Output
Print the responses in Q lines. The i-th line should contain the response to the i-th query.
Sample Input 1
5 2
1 1
4 4
3
3 3
2 3
5 5
Sample Output 1
OK
NG
OK
At time 0, Room 1 and 4 are occupied.
• At time 1, a query asks: "is Room 3 occupied?" Since Room 3 is vacant, we should print OK, then Room 3 gets occupied.
• At time 2, a query asks: "are Room 2 and 3 occupied?" Since Room 3 is occupied, we should print NG.
• At time 3, a query asks: "is Room 5 occupied?" Since Room 5 is vacant, we should print OK, then Room 5 gets occupied.
Sample Input 2
1000000000 1
2 999999999
4
1 1000000000
500000000 500000000
1 1
1000000000 1000000000
Sample Output 2
NG
NG
OK
OK

You are given N records. The content of the i-th record is represented by a string Si. These records are managed in pages, as follows:
• The first page: contains the first, ..., K-th records.
• The second page: contains the (K+1)-th, ..., 2K-th records.
• The third page: contains the (2K+1)-th, ..., 3K-th records.
• :
• The ceil(N⁄K)-th page: contains the ((ceil(N⁄K)−1)K+1)-th, ..., N-th records.
Here, ceil(X) represents the smallest integer not less than X. Print the contents of the records contained in the M-th page, in the order given.
Constraints
• 1≤N≤100
• 1≤K≤N
• 1≤M≤ceil(N⁄K)
• 1≤|Si|≤100 (1≤i≤N), where |S| is the length of S.
• Si is a string consisting of lowercase English letters.
Input
Input is given from Standard Input in the following format:
N K M S1 S2 : SN
Output
Print the contents of the records contained in the M-th page, in the order given. Use L lines, where L is the number of records that should be printed. The i-th line (1≤i≤L) should contain the content of the i-th record contained in the M-th page.
Sample Input 1
5 2 2
aaa
bbb
ccc
ddd
eee
Sample Output 1
ccc
ddd
• The first page contains the first and second records, which are aaa and bbb.
• The second page contains the third and fourth records, which are ccc and ddd.
• The third page contains the fifth record, which is eee.
Since the second page is requested, we should print ccc in the first line and ddd in the second line.
Sample Input 2
7 4 2
this
is
not
displayed
this
is
displayed
Sample Output 2
this
is
displayed

Make a system that returns the average number of hits on the site per minute from the past 5 minutes

You're given an array of integers sorted ( [1,2,3,5,6,7,10]) you need to serialize and compress this array into a string (1-3, 5-7,10)