## SDE1 Interview Questions

- 0of 0 votes
Given a decendents of nodes, write an algorithm to find whether it is a tree or a graph?

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Caeser;s Cipher is a very famous encryptiontechnique used in crptography.It is a type of substitution cipher in which each letter in the plaintext is replaced by letter some fixed number of positions down the alphabet.For example,with a shift of 3 ,D would be replaced bt G,E would become H,X would become A and so on.

Encryption of a letter x by a shift k can bedescribed mathematically as Ek(X)=(X+K)%26.

Given a plain text and it's corresponding ciphertext,output the minimum no negative value of shift that was used to encrypt the plaintext or else output -1 if it is no possible to obtain the given ciphertext from the given plaintext using caeser's cipher technique.

Input

The first line of the input contains Q,denoting the number of queries.

The next Q lines contain two strings s and t consisting of only uppercase letters

output::

For each test case,output a single non negative integer denoting the minimum value of shift that was used to encrypt the the plaintext or else print -1 if the answer does not exist.

Sample Input OUTPUT

2 3

ABC -1

DEF

AAA

PQR

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count Number of balanced Binary Tree given Preorder Sequence length

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Given an array arr and a number n, you have to find whether there exist a subset in arr whose sum is n. You have to print length of the subset.

1. There exists only one subset like that

2. All number in arr are positive

- 1of 1 vote
Find largest sub-array?

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I have a file which has a number of 10 digit numerals and 10 digit alphanumeric characters. Write a UNIX basic command to print distinct 10 digit alphanumeric charters

Sample Input

1234567890

1234567890

123456789X

0974385495

Expected O/P

123456789X

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Delete files of size more than 100mb in a folder which are older than 90 days.

- 0of 0 votes
Given a comma separated file print the last but one column of every line.

e.g:

a,b,c,d,e,f

1,2,3,4

w,x,y,z

output should be

e

3

y

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A binary tree and a number, say k are given. Print every path in the tree with sum of the nodes in the path as k.(A path can start from any node and end at any node, i.e. they need not be root node and leaf node; and negative numbers can also be there in the tree)

- 1of 1 vote
Given an integer target and binary tree (not a binary search tree!) each of whose nodes contains an integer (which may be positive or negative), find the set of all subtrees whose sum equals the given target. The sum of a subtree is just the sum of the integers contained in its nodes. Note that the subtree does not have to contain all child nodes - it can be any set of connected nodes.

- 0of 0 votes
You are given an array A[] with n elements. You are given S[], E[] and H[] array with each M elements.

Apply an operation such that all the elements from A[ S[i] ] and A[ E[i] ] will be less than H[i].

Example :

given array A[] = [2,4,8,6,7]

S[0] = 1

E[0] = 4

H[0] = 5

So, after doing an operation, the resulting array is A[] = [ 2,4,5,5,5]

Thus, u need to do the same thing for all i.

After doing this, find out the maximum element in the array.

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Print elements of a matrix in spiral form.

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It was an over email interview:

Write a program that takes as input a sufficiently large text document (several are available online for testing; e.g. via Project Gutenberg), and produces as output (via stdout) an alphabetical listing of each unique word in the document (case insensitive and space separated, though be careful to consider hyphenated words), along with the lines from the input document that the word appears on. Each unique word (and the list of lines that it appears on) should be on a separate line in the output.

For example, taking the following text as input:

This is

some kind OF text it

Is an example of text

The following would be the output:

an 3

example 3

is 1 3

it 2

kind 2

of 2 3

some 2

text 2 3

this 1

- -2of 2 votes
C++ Questions

- -1of 3 votes
Find sum of n elements after kth smallest element in BST. Tree is very large, you are not allowed to traverse the tree.

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Given a nxn matrix, with partially filled cells of numbers from 1..n and the rest with 0's. Fill the cells such each row and column has numbers 1 to n without any repetition.

Eg:

[

[1, 2, 0],

[0, 1, 0],

[0, 0, 1]

]

[

[1, 2, 3],

[3, 1, 2],

[2, 3, 1]

]

- 1of 1 vote
Given an NxN grid with an array of lamp coordinates. Each lamp provides illumination to every square on their x axis, every square on their y axis, and every square that lies in their diagonal (think of a Queen in chess). Given an array of query coordinates, determine whether that point is illuminated or not. The catch is when checking a query all lamps adjacent to, or on,…

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Function to print shortestpathsum between start and end node of given weighted undirected graph

Comlite the function:

ShortestPathSum(graph g,start,end)

Node(1)----wieght--->node(2)

Node(2)--weight-->node(3)

Node(2)----W----node(4)

Node(3)-----w----->node(5)

Node(4)---w--->node(5)

suppose node(1) is stat node and node(5) is end node

Please write the complite function

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You are a string conscious guy. You categorise strings into 3 types: good, bad, mixed. If a string has 3 consecutive vowels or 5 consecutive consonants or both, it is bad. Else it is good. If a string has ‘?’, that can be replaced with any character. Thus, string ‘?aa’ can be bad if ‘?’ is vowel or good if consonant. Thus, it is mixed. Implement function which takes string s as input and returns good, bad or mixed

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You are a musician who plays different songs at different volumes. You have a particular difference that needs to be present for new song, but you don't care if it is more or less. You are given initial volume l, array of volume changes where arr[i] is volume change required after i-th song, max_vol h (min vol always 0), array size n. You need to find the max possible volume for the last song. But if at any point change is not possible, return -1. Format: n, arr[n], l, h. Ex: 3, 1 1 1, 0, 5. Ans: 3. Ex: 4, 9 1 5 4, 8, 15. Ans: -1. Ex: 3, 5 3 7, 5, 10. Ans: 10.

Input explanation :

First number = size of array,

then next ‘n’ numbers of array.

Then ‘l’ means initial volume

Then ‘h’ means max volume.

Eg. 3, 1 1 1, 0, 5 means n = 3, arr = {1,1,1}, l = 0, h = 5,

Output explanation: initially you play music at vol 0, then for first arr element. Arr[0] inc. by 1,

Arr[1] inc. by 1, arr[2] inc by 1 total = 3

- 0of 0 votes
Implement method:

`Lìst<Range> getRanges(Lìst<Shard> shards, Lìst<Key> keys)`

That returns list of ranges. Each range represents multiple keys aggregated over a shard:

n-keys —> 1-shard —> l-range

Method should return no more than 1 range per shard that spans all keys or their parts belonging to this shard.

Each of the ‘Range` , 'Shard’ and ‘Key’ classes have ‘end’ and ‘start’ fields of int type, where ‘start’ is inclusive and ‘end’ is exclusive.

Example:`1—9, 12—59, 100—999 <— shards (input) 2—3, 6—8, 11—20, 200—220 <— keys (input) 2—8, 12—20, 200—220 <— ranges (output)`

- 1of 1 vote
A list of words is given and a bigger string given how can we find whether the string is a permutation of the smaller strings.

eg- s= badactorgoodacting dict[]={'actor','bad','act','good'] FALSE

eg- s= badactorgoodacting dict[]={'actor','bad','acting','good'] TRUE

The smaller words themselves don't need to be permuted. The question is whether we can find a ordering of the smaller strings such that if concatenated in that order it gives the larger string

One more constraint - some words from dict[] may also be left over unused

- 0of 0 votes
Given the following inputs, return a list of rooms that are available and large enough:

# of people

Start Time

End Time

You should return

total list of rooms

capacity of each rooms

availability

- 0of 0 votes
The stepping number:

A number is called as a stepping number if the adjacent digits are having a difference of 1. For eg. 123,121,9878 are all stepping numbers. While 890, 098,012 are not i.e. a number should not start with 0.

Also all 1-digit numbers are stepping numbers.

Find out how many stepping numbers exist with number of digits =N (input given)

- 2of 2 votes
10000 cameras, 100 hours of video each. 30 fps. Police need to input a plate number and find the path of a suspicious vehicle. (Estimate the size of the video, e.g., blueray disc is 2 hours and 20 GB. No need to scan all of the videos. Estimate the time that a vehicle can be seen between 2 traffic cameras, e.g., 0.3 miles and 30 miles per hour, then select 1 out of 100). Web client, load balancer, servers, db.

- 0of 0 votes
How do I solve this simple geometrical programming problem?

https://s32.postimg.org/sm75dimol/hurdle1.jpg

- 1of 1 vote
How do I find the longest possible route in a matrix?

There are some hurdles in the path.

Details in image : https://s31.postimg.org/7nwp4gmzv/hurdle1.jpg

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Problem : Christmas Tree

Chirag is a boy. And his one and only dream is to meet Santa Claus. He decided to decorate a Christmas tree for Santa on coming Christmas. Chirag made an interesting Christmas tree that grows day by day.

The Christmas tree is comprised of the following

Parts

Stand

Each Part is further comprised of Branches. Branches are comprised of Leaves.

How the tree appears as a function of days should be understood. Basis that print the tree as it appears on the given day. Below are the rules that govern how the tree appears on a given day. Write a program to generate such a Christmas tree whose input is number of days.

Rules:

If tree is one day old you cannot grow. Print a message "You cannot generate christmas tree"

Tree will die after 20 days; it should give a message "Tree is no more"

Tree will have one part less than the number of days.

E.g.

On 2nd day tree will have 1 part and one stand.

On 3rd day tree will have 2 parts and one stand

On 4th day tree will have 3 parts and one stand and so on.

Top-most part will be the widest and bottom-most part will be the narrowest.

Difference in number of branches between top-most and second from top will be 2

Difference in number of branches between second from top and bottom-most part will be 1

Below is an illustration of how the tree looks like on 4th day

https://s31.postimg.org/5s1txk4zf/christmas_tree.jpg

https://s32.postimg.org/i2c6i850l/christmas_tree_2.jpg

- 0of 0 votes
Given some resources in the form of linked list you have to canceled out all the resources whose sum up to 0(Zero) and return the remaining list.

E.g-->> 6 -6 8 4 -12 9 8 -8

the above example lists which gets canceled :

6 -6

8 4 -12

8 -8

o/p : 9

case 3 : 4 6 -10 8 9 10 -19 10 -18 20 25

O/P : 20 25

- 0of 0 votes
In an incoming stream of +ve integers, return true if 2 numbers with sum equal to 10 has occurred till now.

How to handle stream of numbers