## SDE-2 Interview Questions

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What data str should we use to store restaurants(having location info), So that we can easily find the list of restaurants near my current location ?

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Given login/logout time of all users for a particular website in below form.

userId, login time, logout time.

Now store this data in some data structure, so that we can efficiently query total number of users who logedin and logedout in given time range.

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Given an array of 0s and 1s, and k, Find the longest continuous streak of 1s after flipping k 0s to 1s.

E.x array is {1,1,0,0,1,1,1,0,1,1}

k = 1 (which means we can flip ‘k’ one 0 to 1)

Answer: 6 (if we flip 0 at index 7, we get the longest continuous streak of 1s having length 6)

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Design a chat application. How will u handle huge data?

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Design an online pizza delivery system. Complete OO Design needed.

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Organization has online services running across world. To use online services, User create account by entering personal details like - First Name, Last Name, Phone number, Address and etc...

Russia has passed new law that any Russian citizen who is creating account to use online services, his account information needs to store in Russia first and then read-only copies allowed to replicate across the world.

Please suggest cost effective solution/design for this scenario otherwise online services will be blocked to use in Russia. How do we handle if any other country Germany is also come up with this law?

Issues:

1. Do not have mechanism to identify citizenship of user.

2. If Russia user creates an account, he/she should not wait to use online services.

What is cost effective solution?

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Implement a finite state machine.

– The machine should have one start state and can have multiple end states

– It should be extensible (I should be able to add any number of states or transitions at any time)

– I should be able to set notifications on or off for any state or for the whole state machine

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You are given some equations which may contain > or = on different-different operand. For example there are valid input and invalid (a=5, b<a=50)

String e1 = "a>b=1";

String e2 = "a>b=2";

String e3 = "a>c>e=3";

String e4 = "a>c>f=4";

String e5 = "b>a=5";

String e6 = "a>b>c=5";

String e7 = "b=7";

String e8 = "a>b>c>d=99";

String e9 = "a>b=99";

You need to create JSON string from it.

{

‘a’: {

‘b’: [1,2,99],

‘c’: {

‘e’:3,

‘f’:4

}

},

‘b’: {

‘a’ : 5

}

}

Input: You are given those string in string array

Output:

Construct JSON

Print it

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There is down-turn in the ship-building industry. Ace Shipping Corp (ASC) wants to be prepared by having a system that will help evaluate the total cost saving they will achieve if they were to ‘let go’ some employees.

Following are the rules for drawing up this Firing List:

Each manager at every level in the organization will have to contribute ‘heads’ from his team to the firing list

The input to the system would be a small integer k (=1,2, etc) which would be the number of employees chosen per manager. The output would be the total cost saved for this k. Different values of k would give an idea of the total cost saving achieved.

The primary selection criteria is Performance Rating. k employees with the minimum rating under a given manager are to be selected.

If two employees have the same rating, the one with the higher salary gets selected (to maximize cost saved)

The activity might be requested for the sub-org under any manager. The default is to consider the entire org.

Although total number of reportees for a manager is usually of the order of 10, it could possibly be a much larger number in some org too. An optimal way of choosing the k reportees would be preferred.

The following information needs to get stored per Employee:

Employee ID (unique)

Name

Performance Rating (1-5, 1 is lowest, 5 is highest)

Salary (Rs)

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Description:

A company, create classes for each type of employee and calculate working hours and wages/salaries that will be received.

Example General Manager, IT Manager, Accounting, Marketing, Finance, Procurement Managers

Manager and Higher level employees wont have overtime wage. Overtime wage is 1.5 times higher than the usual wage. Working hours are limited as 8 hours. More than this limit will be considered as overtime.

Inputs:

Employee Name, Surname

Title/Role

Salary

Daily Working hour

Outputs:

Date

Employee Name, Surname

Daily Wage.

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There is a car company and customers ask the car company for 'n' cars for start - end time intervals.

A company can get multiples request for the cars, find the minimum numbers of cars that the car company should have, to satisfy all the requirement for the given list of time intervals:

Eg :

for interval 1-3 cars needed are 2

for interval 2 -3 cars needed are 3

for intervals 3-4 cars needed are 4

for intervals 5-6 cars needed are 2

Answer is 5 for above, as we there is overlap between interval 1-3 & 2-3

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I have a photo storage service. The actual photos are present in some storage and the index of these photos is present at some other place. The index is huge, say trillions of photos. Design the class for index node of each photo (with attributes like name*, date*, size*, accesscontrol, camera details, shot details, etc) such that 1. It is serializable. 2. For faster processing, I am interested in first 3 attributes. When deserializing the bytes of object, parse these 3 attributes i.e. instead of deserializing whole class, deserialize only part of the class (members marked by*), other members of class should be deserialized on demand with another call.

How will you test the performance of your serialization/ deserialization?

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there is a chess board of dimension n X n. You are given with 2 squares on that board S(x1,y1) ;M(x2,y2). S is a fixed point. M can move diagonally. it can move any number of steps or jumps in 1 move . Find the minimum number of moves M needs to reach S

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there is a news publishing/subscribing product of Amazon where electronic contents are collected from owners like newspaper, magazines. Customer is using kindle. Design how customer will get the content when his system kindle connects to net. how to send the contents to device?

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This was a design question, discuss data structures/ complexities, etc.

There is a huge HashMap (Key-Value store). This is present in storage, dont worry about the Storage.

1. Build its index. Distributed system for indexing. Different cases: Key is a String/ Double/ complex structure, etc. How will you replicate this index structure - whole index is replicated/ parts of index are replicated.

2. How will you synchronize access (read/ write) if there are multiple replicas of the index partition. What if the actual Storage partition also has replicas.

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You have a function f1() that generates 0 or 1 with the equal probability. Write a function f200() that generates a number between 1 and 200 with equal probability.

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`Please analyze the two slightly obfuscated Tcl procedures below and document the code as it should be. Please change the symbol names to reasonable descriptive names. In addition, an explanation of why these procedures might or might not be useful or suggestions for improvements would be most welcome. This code comes from the application you would be working on. I replaced the names and removed the comments to make the challenge. Feel free to do research and experimentation, but please do not ask anyone else to solve it for you. proc f1 {a} { set n [llength $a] set p {} for {set i 0} {$i < $n} {incr i} { for {set j [expr {$i + 1}]} {$j < $n} {incr j} { lappend p [list [lindex $a $i] [lindex $a $j]] } } return $p }`

`proc f2 {fn lst {vn {}\}} { set result {} lassign $fn a b n if {$n eq {}} { set n {::} } set cl {} foreach n $vn { upvar 1 $n v set cl "${cl}set $n {$v}\n" } set cfn [list $a "${cl}${b}" $n] foreach item $lst { lappend result [apply $cfn $item] } return $result }`

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Given a log file:

some garbage...from:123.54,78.21...more garbage..to:56,82,124.54...more

some more garbage...from:11.54,45.84...garbage..to:115.87,98.65

...

Write a program or shell script to return pairs of (from, to) coordinates.

Assumption: these coordinates will always appear in sequence: from ... to... from ... to...

But these from - to pair may or may not be on same line.

- 1of 1 vote
You have a BST and you need to assign an appropriate value to neighbor of all nodes (Explained in below example)

Node Structure`node { node leftChild, node rightChild, T data, node neighbor }`

A

/ \

B C

/ \ \

D E F

Based on above tree,

Node: Neighbor

A: NULL

B: C

D: E

E: F

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Given an array of stock values of a company. Find out the time when a user would have bought the stock and sold the sock. Basically find the maximum positive difference of any two given elements in an array?

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Given a binary tree print it in inward spiral order i.e first print level 1, then level n, then level 2, then n-1 and so on.

For Ex -

1

2 3

4 5 6 7

8 9 10 11 12 13 14 15

Print- 1 15 14 13 12 11 10 9 8 2 3 7 6 5 4

Follow up question - Extend the algorithm to n-ary tree.

- 3of 3 votes
Given a singly connected linked list, find the largest palindrome in the list in O(1) space.

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Given a linked list consisting of String in each Node . Given just a pointer to the head Node find whether the resultant String formed by combining all the Nodes of the linked list is a palindrome or not in O(1) space and O(n) time.

eg – Consider this linked List structure

“aba” -> “cd” -> “efe” -> “d” -> “caba”

Hence this structure is palindrome .

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Face to Face

Q4) two arrays given to you. First array contains number s. Second array contains key values.

We need to find smallest window in first array which covers all second array elements.

e.g:

Input= {6,7,1,3,2,4,5,2,3,1,2,5}

Keys = {2,5,1}

answer: from 9th index to 11th index is the smallest window.

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Face to face

Q3) stream of numbers coming, get 'n' min elements at any point of time

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Written test:

Q2) in single linked list reverse alternative k nodes.

e.g. k=3 , 1->2->3->4->5->6->7->8->9->10

3->2->1->4->5->6->9->8->7->10

void reverseAlternativeKNodes(node *&head, int k);

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Written Test question:

Q1) Given binary tree find largestPath size from one leaf to another leaf.

int getLargestPathSize(node *root);

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Given an N-ary tree with thousands of nodes in it. Pair (Join) the Leaf nodes which do NOT SHARE the common path. i.e. Two Leaves can be Paired only if they do NOT have Intersecting path.

For example,

A

/ | \

B C D

/ / | \

E F G H

Leaf nodes: E, F, G, H & D

Possible Pairs in O/Ps:

a) (E-F), (G-H) or

b) (E-G), (F-H) or

c) (E-H), (F-G) or

d) (E-D), (F-G) or

e) (E-D), (G-H) or

f) (E-D), (F-H) or

g) (D-H), (F-G) or

h) (D-G), (F-H) or

i) (D-F), (G-H)

Note: If we pair(join) say, (E-F) then we can NOT pair any of the (D-G) or (D-H) as they SHARE the COMMON path from A to C.

i.e. E-B-A-C-F —> (E-F) pair

D-A-C-G —> (D-G) pair

D-A-C-H —> (D-H) pair

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Given a tree, and a pointer to some node in the tree, print the left most element in the same level as that node

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Given an input of the calendar objects of 10,000 employees, input is a time interval T and an employee[] array, find the first interval where all the employees in the employee[] array are free for a minimum time interval T (i.e schedule the meeting)