CareerCup

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

Given an array of strings, find out in how many cases is any of the anagrams of the string at location i, a substring of the string at location i+1.

Test Case I: ["ab", "ab", "abc", "bca"]
Answer: 3

Test Case II: ["ab","aqb"]
Answer: 0

Given a target sum, populate all subsets, whose sum is equal to the target sum, from an int array.

For example:

Target sum is 15.

An int array is { 1, 3, 4, 5, 6, 15 }.

Then all satisfied subsets whose sum is 15 are as follows:

15 = 1+3+5+6
15 = 4+5+6
15 = 15

Genarate and validate a magic matrix.A magic matrix is one in which the sum of every row,column,and every diagonal is same.One such matrix will be when every element in the matrix is same.generate and validate a magic matrix where every element is not the same

Coin change problem with finite number of coins available
denominations of coins = {1,2,3}
count of coins = ={1,1,3}
find the number of ways for getting change for S=6

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

Write algorithm for java grep command for word matching in the following context.Given a file containing n words.Given a word w and a number k.Find k words in the file occuring before occurence of w.Assume that the average word size is m in the file
eg.
aaa
bbb
ccc
booking
alpha
beta
gamma

for k=3 and w = booking
the output should be [aaa,bbb,ccc,booking]
similarly for k =2 and w = beta
output should be [booking,alpha,beta]
Assume that the file size can grow very large
and try to get solution with space complexity lesser than O(n)

I suggessted solution for iterating through file until the word w is found and maintaiining a queue of size K
The time complexity of my solution was O(nm)
and space complexity was O(k) .Any answers to improve the time and space complexity
Apparently they were looking for a better implementation of grep

We start with a list of Integers. We can remove a group of integers from the list if the all but one equals the remaining number. This removal operation can be performed in the remaining number of list until no more operations can be performed.
Write a function which can accept an array of integers, and return the minimal number of remaining integers from performing this operation.
Example [1, 3, 5, 6] -> remove 1, 5, 6 , because 1 + 5 = 6, thus only [3] left, so return 1
[48, 20, 1, 3, 4, 6, 9, 24] -> remove 3, 6, 9 , because 3 + 6 = 9, and remove 4, 20, 24, 48, because 4 + 20 + 24 + 48, thus only [1] left, so return 1
int left(int[] nums){
}

Consider an N*N game board, with a black and white pieces that can be placed on it. You are given a board with placed pieces around it in a random spots.

You need to implement a function that determines if a piece (black or white) is captured on a given coordination (x, y).

A piece is defined as captured by the following rules:
1. If all sides (up, down, left & right) contains an opposite piece that surrounds/blocking it.
2. If some of the sides are blocked (for example, right and down) and the other ones are out of bound (OOB defined for coords: x: <= 0, y: <= 0) it's considered as blocked.
3. If one of the sides is empty, it's free.
4. If one of the sides contains the same piece type, and that piece is not captured (by the rules above), it's free.
5. Note that pieces may be captured in a clustered way (related to #4).

For example, consider the following coordinates:
coord(1,1) = B
coord(1,2) = W
coord(2,1) = W

X | 1 | 2
1 | B | W 			
2 | W |

For the given coordination 1,1 the result would be `captured` (true).

Another example, consider the following coordinates:
coord(2,2) = W
coord(2,3) = W
coord(3,1) = W
coord(3,2) = B
coord(3,3) = B
coord(3,4) = W
coord(4,2) = W
coords(4,3) = W

X | 1 | 2 | 3 | 4 | 5 |
2 | E  | W | W | W | E
3 | W  | B | B | B | W	
4 | E  | W | W | W | E

For the given coordination 3,2 (or 3,3) the result would be `true` (captured).
If we would either remove one of the W coords (thus making it empty), or change it to be a B piece, the result would be `false` (not captured).

As basic primitive, you are provided with a function that translates coordination into its state:

getState (x, y) == Black, White, Out Of Bound, Empty

Explain the Data Structure which is well suited to implement UNIX commands like PWD, LS, MKDIR, CD in an imaginary OS. No code required.

Unsorted array and a position ‘P’. Return the element that is likely to come to the given location upon sorting the array. TC in O(n).

A thief trying to escape from a jail has to cross ‘N’ walls each with varying heights. He climbs ‘X’ feet every time. But, due to the slippery nature of those walls, every times he slips back by ‘Y’ feet. Now the input is given as (N, {H1, H2, H3,….Hn}, X, Y}. Calculate the total number of jumps required to cross all walls and escape from the jail.

transactions = [
{"payee": "BoA", "amount": 132, "payer": "Chase"},
{"payee": "BoA", "amount": 827, "payer": "Chase"},
{"payee": "Well Fargo", "amount": 751, "payer": "BoA"},
{"payee": "BoA", "amount": 585, "payer": "Chase"},
{"payee": "Chase", "amount": 877, "payer": "Well Fargo"},
{"payee": "Well Fargo", "amount": 157, "payer": "Chase"},
{"payee": "Well Fargo", "amount": 904, "payer": "Chase"},
{"payee": "Chase", "amount": 976, "payer": "BoA"},
{"payee": "Chase", "amount": 548, "payer": "Well Fargo"},
{"payee": "BoA", "amount": 872, "payer": "Well Fargo"},


There are multiple transactions from payee to payer. Consolidate all these transactions to minimum number of possible transactions.
HINT: Consolidate transitive transactions along with similar transactions

Design a space shooter program .
Note: The game includes spaceship , bullets and asteroids. Spaceship rotates in 180 degree generating bullets. The position of the bullets gets updated after certain time period every time . No Need to write the code for collision detection
Basic code in expected . Not the entire working code.

Given a list/array of "Assign" trees with integers, operators and variables, return the result of the requested "Result" tree expression.

Example:

"Assign"
  /  \
"x"  "+"
    /   \ 
   2     3

"Assign"
  /  \
"y"  "-"
    /   \ 
  5000  30

"Assign"
  /  \
"z"  "*"
    /   \ 
  50     x

"Return"
  \
  "-"
  /  \    
 z   "*"
     / \
    1   y

The array of integers in given . The array indicates nothing but the heights of the cylinders. The robotic arm has two ends-> left and right.
The left end points to the left end of the cylinder array and right end searched for the cylinder with least height.
ex:
array = {4,5,6,7,1,2}
left end => index 0
right end =>index 0->n giving index 4 with min height
Now the entire block is rotated by 180 degree.
now the array = { 1, 7, 6, 5, 4, 2}
now the left end moves forward.
and right end will search from left index onwards till the end of the array
so left index = 1
right index => 1-> n giving index 5 as min. height
again do the block rotate .
Write the code for this particular algorithm.
However, there is one condition
1. If there are duplicates in the array then the final order of those duplicates should remain the same.
ex. If the cylinder with height 4 is appearing at index 3 and 5 in the initial array then the cylinder at index 3 should always appear before the one at index 5 in the final array.

The array of integers in given . The array indicates nothing but the heights of the cylinders. The robotic arm has two ends-> left and right.
The left end points to the left end of the cylinder array and right end searched for the cylinder with least height.
ex:
array = {4,5,6,7,1,2}
left end => index 0
right end =>index 0->n giving index 4 with min height
Now the entire block is rotated by 180 degree.
now the array = { 1, 7, 6, 5, 4, 2}
now the left end moves forward.
and right end will search from left index onwards till the end of the array
so left index = 1
right index => 1-> n giving index 5 as min. height
again do the block rotate .
Write the code for this particular algorithm.
However, there is one condition
1. If there are duplicates in the array then the final order of those duplicates should remain the same.
ex. If the cylinder with height 4 is appearing at index 3 and 5 in the initial array then the cylinder at index 3 should always appear before the one at index 5 in the final array.

Generate a random number with UNIFORM DISTRIBUTION between [0,n) where n is given and excluded list is given. The randomly generated number should belong to the range [0, n) but should be excluded from the given excluded list. For example, n = 10 and excluded list ={2,3,0} then the random number should be from {1,4,5,6,7,8,9} such that any number from the list {1,4,5,6,7,8,9} has UNIFORM probablility of occuring

Perform left and right shift on string

Find max sum of sub array.

Implement stack using a queue.

Merge the overlapping intervals.

Reverse the words in string eg. 'The Sky is Blue'. then print 'Blue is Sky The'.

Find max sum of subarray

java program to interchage continous vowels in a string
ex:vowels
becomes vewols
continuous becomes cintonouuus

Consider an implementation of Strings consisting of an array where the first element of the array indicates the length of the String and the next elements represent the value of the ASCII characters in the String. Implement String concatenation and discuss shortcomings of this operation under this implementation of Strings.

Suppose that there exists a service to fetch Facebook posts through an interface defined by you, design the Facebook wall feed.

Given an array of ints and a value X, find wether there are 3 elements in the array such that their sum is X (return true/false).

Given two vectors that might be sparse, calculate their Dot product. You can assume any data structure to represent the vectors.

Given a matrix of characters where '_' represents an empty space, 'T' is a tree and 'H' is a house and a coordinate of that matrix, find the sum of the minimum distances from that coordinate to each house when considering that you can move through empty spaces and houses but not through trees.