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-Phone: LC304 & longest arithmetic sequence. Return the sequence.

Given a string S(a data structure) that contains only square brackets, convert it to an array that stores arrays in the following format: [positionOpeningBracket, positionClosingBracket, nestedDataStructure]. Example: https://i.imgur.com/vZhlZdr.png

def parser(S):
	#whatever...
	print(r)

parser("[[]][]") #output: [[0,3,[1,2,null]], [4, 5, null]]

Question 1.
You are given a string composed of uppercase English letters (‘A’ through ‘Z’).

Set of letters (‘A’, ‘E’, ‘I’, ‘O’, ‘U’) are called vowels. Other letters are called consonants.

We define foo value of a string as number of pairs of exactly same consecutive vowel letters.

For example,
Ex.1: BCDEEIOU - This has a foo value of 1 (because of EE). Note that although I is next to E, and O is next to I, and U is next to O, they aren’t exactly same neighbours, so they don’t contribute to foo value

Ex.2: BCDEEEIOU - This has foo value of 2. Because of first pair of EE and immediately next pair of EE

Ex.3: ABCDEFG - This has foo value of 0. There are no consecutive vowels

Ex.4: ABEUUOUOO - This has foo value of 2, because of UU and OO

You are given 2 inputs, N and K.
How many strings of length N can you form such that they all have foo value of K?

Let’s assume the constraints as:

1<=N<=15
0<=K<N

Given a sorted list of integers, square the elements and give the output in sorted order.

Find the distance between the farthest two elements in a binary tree.

A text file contains {candidateID,voterID} details of an ongoing voting.
Read this file in real time and report top 5 candidates.
Also report a fraud if a Voter tries to vote twice or try to vote more then one candidate.
Assume that the database is offline.

Given list of line segments({x_start, y_start}, {x_end, y_end}) find out the maximum number of points they intersect. (interviewer said, he can make it simpler by assuming only vertical or horizontal lines with no overlapping lines)

Givenen tree in which each node has (or grows) exactly 4 children with values (2, 2.5, 8, 50) plus the value of its parent node. Find out the least K values.

e,g, k = 5, node with value 2, 2.5, 4, 4.5, 6

List of processes with start time, end time and bandwidth. Find the maximum bandwidth for the list.

2. Given N teams which need to play each other exactly once but at most once in one day, output the game schedule.

Snake and ladder game. Given a board state with position information for snakes and ladders, find the minimum number of ways(aka dice throws) one can reach from start to end.

Longest substring palindrome

(interview looking for n^2 or less solution)

Airbnb Online Assessment Paginate List

5
13
1,28,310.6,SF
4,5,204.1,SF
20,7,203.2,Oakland
6,8,202.2,SF
6,10,199.1,SF
1,16,190.4,SF
6,29,185.2,SF
7,20,180.1,SF
6,21,162.1,SF
2,18,161.2,SF
2,30,149.1,SF
3,76,146.2,SF
2,14,141.1,San Jose


Here is a sample input. It’s a list generated by user search.
(1,28,100.3,Paris) corresponds to (Host ID, List ID, Points, City).

5 in the first row tells each page at most keeps 5 records.
13 in the second row is the number of records in the list.

Please paginate the list for Airbnb by requirement:
1. When possible, two records with same host ID shouldn’t be in a page.
2. But if no more records with non-repetitive host ID can be found, fill up the page with the given input order (ordered by Points).

Expected output:
1,28,310.6,SF
4,5,204.1,SF
20,7,203.2,Oakland
6,8,202.2,SF
7,20,180.1,SF

6,10,199.1,SF
1,16,190.4,SF
2,18,161.2,SF
3,76,146.2,SF
6,29,185.2,SF -- 6 repeats in page bec no more unique host ID available

6,21,162.1,SF
2,30,149.1,SF
2,14,141.1,San Jose

Find the indices of all anagrams of a given word in a another word.
For example: Find the indices of all the anagrams of AB in ABCDBACDAB (Answer: 0, 4, 8)

Given 2 words, return true if second word has a substring that is also an anagram of word 1.
LGE , GOOGLE- True
GEO, GOOGLE - False

Given two list of unsorted intervals V1 and V2 write 2 functions 'OR ' and 'And' to return a new list

OR Function (union of list ): Input V1 = (2,4) (6,8) (1,3) V2 = (7,9) (2,5)
output = (1,5) (6,9)

And function : This will be intersection function and will return intersection of the lists

Check if two DOM Trees have the same text.
e.g. <html><p>hello</p></html>, <html><p><b>h</b>ello</p></html> should be the same text

DOMNode class definition (string tag, string text, bool isText, vector<DOMNode*> children)

create a class of integer collection,
3 APIs:
append(int x),
get(int idx),
add_to_all(int x)，
in O(1) time。

Follow-up:
implement
multiply_to_all(int x)

e.g.
insert(1)
insert(2)
add_to_all(5)
insert(3)
get(0) -> returns 6
get(2) -> return 3
multiply_to_all(10)
insert(4)
get(1) -> returns 70
get(2) -> returns 30
get(3) -> returns 4

Lonely Pixel
Given an N x M image with black pixels and white pixels, if a pixel is the only one in its color throughout its entire row and column, then it is a lonely pixel. Find the number of lonely pixels in black from the image. (O(NM))

Find max size of contiguous shape below, where X represents a shape and . is empty:

.XXXXXX....
...X..XX..X
...XXXX....
..X.....X..
..XXX..XX..
.....XX....
/*method stub*/
public int GetMaxShape(char[][] array) {
}

i was able to come up with a recursive solution but i'd love tips on a dp solution

Inserting dashes between two odd numbers and star between two even numbers

Print Common Suffix In Strings

Ex: cornfiled , Exfiled --- field

Given an unsorted array. for example [2, 3, 1, 4, 5].
Sort the array, we have new array [1, 2, 3, 4, 5],
if we draw the line between the 2 arrays for the same number, for example:

[3, 2, 1,4,5]
\ | /
\|/
/|\
[1, 2, 3,4,5]
then we have 3 line-cross:

line (1 to 1) cross line (2 to 2)
line (1 to 1) cross line (3 to 3)
line (2 to 2) cross line (3 to 3)
Note: the line between two 4s and the line between two 5s don't cross any other lines;

Implement the algorithm to calculate the how many line crosses for an unsorted array.

You are given an alphanumeric string. Complete the function sortSegments that will segment the string into substrings of consecutive letters or numbers and then sort the substrings.

For example, the string "AZQF013452BAB" will result in "AFQZ012345ABB". The input letters will be uppercase and numbers will be between 0 and 9 inclusive.

You are given an integer array n. Complete the function sortIntegers which takes as an argument, an integer array n of up to 1 million integers such that 1 <= n_i <= 10.
for every element n_i in the array, and returns the sorted array. The sort does not need to occur in-place.
Please do not call a standard sorting function like quicksort, you can do better. A sample input is {3, 1, 4, 1, 5, 9, 2, 6, 5} and the corresponding output is {1, 1, 2, 3, 4, 5, 5, 6, 9}. Constraints: i <= 10^9; 1 <= n_i <= 10

This was a 3 hours coding round in which we had to code 1 problem having 50 test cases. Only those students were selected for the next round who passed all the test cases. Here is the question:
You’ll be given a grid as below:

0 1 0 2 0
0 2 2 2 1
0 2 1 1 1
1 0 1 0 0
0 0 1 2 2
1 1 0 0 1
x x S x x
In the grid above,
1: This cell has a coin.
2: This cell has an enemy.
0: It contains nothing.
The highlighted(yellow) zone is the control zone. S is a spaceship that we need to control so that we can get maximum coins.
Now, S’s initial position will be at the center and we can only move it right or left by one cell or do not move.
At each time, the non-highlighted part of the grid will move down by one unit.
We can also use a bomb but only once. If we use that, all the enemies in the 5×5 region above the control zone will be killed.
If we use a bomb at the very beginning, the grid will look like this:

0 1 0 2 0
0 0 0 0 1
0 0 1 1 1
1 0 1 0 0
0 0 1 0 0
1 1 0 0 1
x x S x x
As soon as, the spaceship encounters an enemy or the entire grid has come down, the game ends.
For example,
At the very first instance, if we want to collect a coin we should move left( coins=1). This is because when the grid comes down by 1 unit we have a coin on the second position and by moving left we can collect that coin. Next, we should move right to collect another coin( coins=2).
After this, remain at the same position( coins=4).
This is the current situation after collecting 4 coins.

0 1 0 2 0 0 1 0 0 0
0 2 2 2 1 -->after using 0 0 0 0 1
x x S x x -->bomb x x S x x
Now, we can use the bomb to get out of this situation. After this, we can collect at most 1 coin. So maximum coins=5.

Employees Per Department
Twitter Interview Online Test SQL

A company uses 2 data tables, Employee and Department, to store data about its employees and departments.

Table Name: Employee
Attributes:
ID Integer,
NAME String,
SALARY Integer,
DEPT_ID Integer

Table Name: Department
Attributes:
DEPT_ID Integer,
Name String,
LOCATION String

View sample tables:
https://s3-us-west-2.amazonaws.com/aonecode/techblog/50cfcdd1d61f1bd6002cf4d3b4a61deb-min.jpeg

Write a query to print the respective Department Name and number of employees for all departments in the Department table (even unstaffed ones).

Sort your result in descending order of employees per department; if two or more departments have the same number of employees, then sort those departments alphabetically by Department Name.

The numbers on a telephone keypad are arranged thus:

1 2 3
4 5 6
7 8 9
  0

Starting from any digit, and choosing successive digits as a knight moves in chess, determine how many different paths can be formed of length n. There is no need to make a list of the paths, only to count them.

A knight moves two steps either horizontally or vertically followed by one step in the perpendicular direction; thus, from the digit 1 on the keypad a knight can move to digits 6 or 8, and from the digit 4 on the keypad a knight can move to digits 3, 9 or 0. A path may visit the same digit more than once.

Your task is to write a function that determines the number of paths of length n that a knight can trace on a keyboard starting from any digit .
public int findNumberOfPaths(int digit, int step){

## This is the text editor interface.
## Anything you type or change here will be seen by the other person in real time.
# Implement the function that takes a board string
# and decodes it into the representative 2D array.
#
# |_|_|_|_|_|_|_|
# |_|_|r|_|_|_|_|
# |b|r|b|r|b|r|_|
# |b|b|b|r|r|b|_|
# |b|r|r|b|b|r|_|
# |r|b|b|r|r|r|b|
# CFN: 9_r4_brbrbr_3b2rb_b2r2br_r2b3rb
#
# This function should return a list of lists of strings.
# (i.e. a string[6][7]). The strings should be one of:
# * 'r' to indicate a red piece
# * 'b' to indicate a black piece
# * '_' to indicate an empty space
#
# The input string is not necessarily a valid
# CFN board string. It is guaranteed not-empty.

III. Square root of a number?

IV. Expression operators? Add signs (+, -, *, /) to a string to form target

V. Top trending posts in last 5m, 1H, 1Day?

I. Closest K nodes to a target in BST? (Do it in O(n)?)

II. Nested List sum?

Generate a random binary tree, with equal probability.