## Recent Interview Questions

- 0of 0 votes
Write a word processor that can do left and right justification for a sample input of string type.

Here is an example:

This is a sample.This is a sample.This is a sample.

This is a sample.This is a sample.This is a sample.This is a sample.

Additional details:

* The left margin is 5 units.

* The right margin is 75 units.

* The input string is a single-spaced collection of words and punctuation.

* If the length of the word exceeds the right margin, then we must not break the word. Instead, we must print it on the next line and justify the existing line by adding more spaces to the middle of the line.

- 0of 0 votes
Given an integer n (say somewhere between 100 and 1000), you want to generate a random binary tree having exactly n nodes. You are only interested in the structure of the tree. Each structurally unique tree should ideally have the same chance of being generated.

- 1of 1 vote
Given a binary matrix, find if there is a path from the upper left corner to the lower right corner, meet the conditions each time the value of the cell must be different.

Follow up if there is a path with the same number of 0 and 1?

- 0of 0 votes
Given k numbers as strings. The numbers may be very large (may not fit in long long int), the task is to find sum of these k numbers.

Example

S1 = “100”

S2 = “10”

S3 = “1”

Return “111”

public string addNumbers(String[] nums){

}

- 0of 0 votes
A number is special if it is possible to remove some digits from it to get a number having 3, 5 or 6 only.

For example, 38597 is special since it is possible to remove digits 8, 9, 7 to get 35. You cannot remove all the digits.

You can remove digits from left, right or middle.

Write a program in C which given a number N, calculate how many divisors of N are special

- 0of 0 votes
Given the N*N matrix, find the given number in the matrix. All rows are sorted. And each row first element is less than the previous row last index.

input :

[1,3,5,7,9]

[11,13,15,16,20]

[21,22,23,24,25]

[30,32,35,40,45]

Given Num : 23

What is the best Optimal solution ? I have used BST but the interviewer asked to use any other which could do better in the above scenario.

- 0of 0 votes
Given the below input and ouput.

Input :

String[] input = {"hello", "world"};

output: (Higher count should come before and natural order)

hello : l=2, e=1,h=1,o=1

world: d=1,l=1,o=1,r=1,w=1

- 0of 0 votes
given an array of integers suppose 1234, print all groups of integer array possible of length upto n where n can be any number greater than zero

example for n=5

1,11,111,1111,11111,12341,22222,2222,222,22,2 etc

for n=3

1,11,123 etc

- 0of 0 votes
There is a process sequence that contains the start and end of each process. There is a query sequence asking how many processes are running at a certain point in time. Please return the query result of the query sequence.

Example

Given logs = [[1, 1234], [2, 1234]], queries = [2], return [2].

Explanation:

There are 2 processes running at time 2.

Given logs = [[1, 1234], [2, 1234]], queries = [1, 1235], return [1, 0].

Explanation:

There is a process running at time 1, and 0 processes running at time 1235.

- -1of 1 vote
Given:

R number of Red Cards

B number of Black cards

K

Cards needs to be placed in a circle. Start from a position and for

every K moves remove that card And

repeat the process until all the cards are eliminated.

Question: Position the cards such that the red cards are completely

eliminated before the blacks cards are selected for elimination.

- 0of 0 votes
Given a BST convert it into new Data Structure that satisfies following conditions:

1. every leaf node's left ptr point to its parent and right ptr points to the next leaf

2. every non leaf node's left ptr points to its parent and right ptr is NULL

3. return the head and print the new DS`example: 7 / \ 5 9 / \ \ 4 6 10 output: head->4->5->7 | ->6->5->7 | ->10->9-7`

with optimal time and space complexity

- 0of 0 votes
input: "kitten%20pic.jpg"

output: "kitten pic.jpg"

%20 -> ' '

%3A -> '?'

%3D -> ':'

modify your input in place.

no string library functions.

void Decode(char[] str)

- 0of 0 votes
Given a string T of length n, partition it in n' "phrases" (p1, p2, ..., pn'),

such that

pi = pj + c, for some j<i, where + is string concatenation and c is a character

p0 = ''

p1 = pj + c where j < 1

T = p1 + p2 + ... + pn'

For example:

T = aababcabcd = a + ab + abc + abcd

p1 p2 p3 p4

- 0of 0 votes
Print a binary tree in vertical order using singly linked list...

- 0of 0 votes
There are three threads and we want them to run

one after the other. How can we do that?

- 0of 0 votes
In a grid, you are given a position, and every location has some value.

find the shortest length so that you can touch to any boundary of the grid.

- 0of 0 votes
You are given a graph and an algorithm that can find the shortest

path between any two nodes

Now you have to find the second shortest path between same two nodes.

- 0of 0 votes
Find product of distinct prime

factor of all numbers .

Ex

10

12

7

prime factor of 10 = 2*5

prime factor of 12 = 2*2*3

prime factor of 7 = 7

SO distinct prime factor is 2*5*3*7 = 210

- 0of 0 votes
encode binary in bytes is to give a matrix of size M * N,

This matrix is encoded in bytes as a 4 * 4 bool matrix

[0 0 0 0

1 0 0 1

0 0 0 0

0 0 0 1]

Will be encoded as a byte array [9, 1].

Then write a function set_one (vector <byte> arr, int M, int N, int start_row, int start_col, int end_row, int end_col);

Set all of 0 from (start_row, start_col) to (end_row, end_col) to 1

for example

start_row = 1

start_col = 2

end_row = 2

end_col = 0,

Just that 4 * 4matrix will become

[0 0 0 0

1 0 1 1

1 0 0 0

0 0 0 1]

The byte array after encode should be rewritten as [11, 129].

- 0of 0 votes
find out all of the state machine will guaranteed to come to safe state

ex

A -> [B, C, D, E]

B -> [A]

C -> [D, E]

D -> [E].

E -> [safe state]

Output [C, D, E] because once these states will eventually go to safe state

- 0of 0 votes
Aisles contain products. Product is only going to be in one Aisle.

Product{

AisleID: string

ProductID: string

Price: float

}

Given Array<Product>, find the N highest price combinations. Combination is 1 product from each aisle. You can choose only one instance of each product.

So if you had two aisles

1: {$5,$4,$2}

and

2: {$6,$1)

And they asked for the 2 highest combos you would give $6,$5 and $6,$4

- 0of 0 votes
Write a simple RegEx parser function that handles only the

operators * (0 or more) and + (1 or more), and returns true if

the provided string is a match. Signature:

boolean isMatch(String regex, String input).

Example: regex = a*b+ce, input = bce, return true

Example: regex = a*b+ce, input = ace, return false

Example: regex = a*b+ce, input = abcee, return false

- 0of 0 votes
Given a tree and a number N,

construct another tree such that each node of the tree has either 0 or

N elements,except for one node which has between 0 to N elements.

Only other constraint is

that ancestry is preserved in the new tree.

- 0of 0 votes
given start and end of a given set of meetings, asking how to schedule

as many meetings as possible。

- 0of 0 votes
find a points that has same distance to given three points

- 0of 0 votes
input is an int [] number is the car number parked in the parking lot, 0 for empty spaces

Output is also an int [] requires a method to convert the input into target array.

Each car can only be exchanged with a 0.

- 0of 0 votes
`Given a string s1, we may represent it as a binary tree by partitioning it to two non-empty substrings recursively. Below is one possible representation of s1 = "great": great / \ gr eat / \ / \ g r e at / \ a t To scramble the string, we may choose any non-leaf node and swap its two children. For example, if we choose the node "gr" and swap its two children, it produces a scrambled string "rgeat". rgeat / \ rg eat / \ / \ r g e at / \ a t We say that "rgeat" is a scrambled string of "great". Similarly, if we continue to swap the children of nodes "eat" and "at", it produces a scrambled string "rgtae". rgtae / \ rg tae / \ / \ r g ta e / \ t a We say that "rgtae" is a scrambled string of "great". give a string s, print all the scrambled string of it class Solution { public List<String> ScrambleString(String s) { } }`

- 0of 0 votes
The problem is to count all the possible paths from any points to bottom right of a mXn matrix with the constraints that from each cell you can either move only to right or down

- -1of 1 vote
We have two sequences A and B consisting of integers, both of length N, and you would like them to be (strictly) increasing, i.e. for each K (0 ≤ K < N − 1), A[K] < A[K + 1] and B[K] < B[K + 1]. Thus, you need to modify the sequences, but the only manipulation you can perform is to swap an arbitrary element in sequence A with the corresponding element in sequence B. That is, both elements to be exchanged must occupy the same index position within each sequence.

For example, given A = [5, 3, 7, 7, 10] and B = [1, 6, 6, 9, 9], you can swap elements at positions 1 and 3, obtaining A = [5, 6, 7, 9, 10], B = [1, 3, 6, 7, 9].

Your goal is make both sequences increasing, using the smallest number of swaps.

Write a function:

public int minswaps(int[] A, int[] B);

that, given two zero-indexed arrays A, B of length N, containing integers, returns the minimum number of swapping operations required to make the given arrays increasing. If it is impossible to achieve the goal, return −1.

For example, given:

A[0] = 5 B[0] = 1

A[1] = 3 B[1] = 6

A[2] = 7 B[2] = 6

A[3] = 7 B[3] = 9

A[4] = 10 B[4] = 9

your function should return 2, as explained above.

Given:

A[0] = 5 B[0] = 2

A[1] = -3 B[1] = 6

A[2] = 6 B[2] = -5

A[3] = 4 B[3] = 1

A[4] = 8 B[4] = 0

your function should return −1, since you cannot perform operations that would make the sequences become increasing.

Given:

A[0] = 1 B[0] = -2

A[1] = 5 B[1] = 0

A[2] = 6 B[2] = 2

your function should return 0, since the sequences are already increasing.

Assume that:

N is an integer within the range [2..100,000];

each element of arrays A, B is an integer within the range [−1,000,000,000..1,000,000,000];

A and B have equal lengths.

Complexity O(N)

- 0of 0 votes
Find the final states of a n-nary tree

each node has three states, 0,1,2.

Require that if all child nodes are 2,

The parent node is also 2.

All child nodes are 0, the parent node is 0, and the rest are all 1s.