CareerCup

A happy number is defined by the following process. Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. Those numbers for which this process ends in 1 are happy numbers, while those that do not end in 1 are unhappy numbers.
Input:
Your program should read lines of text from standard input. Each line contains a single positive integer, N.
Output:
If the number is a happy number, print 1 to standard output. Otherwise, print 0.

Maximum Pairs

You are given N pencils. You have to make pairs of pencils.

The condition for making pairs is:
If(a,b) is any pair of pencils then b >= 2 * a. Here a and b are the sizes of pencils.

Now you have to find out the number of such pairs and the number of pencils which could not be paired with any pencils.

Note:

You need to pair the pencils in such a manner that the maximum number of pairs are formed.

Input Format:

The first line consists of number of test case T.
Each test case consist of:
- First line consists of a single integer N.
- Second line consists of N space-separated integers denoting the size of pencils Si.

Output Format:

For each test case, print two space-separated integers, first denoting the number of pairs formed and second denoting the number of unpaired pencils.
Answer for each test case should come in a new line.

Constraints
1<T<=10
1<=N<=10^5
0<=Si<=10^5

Sample Input

2
5
1 2 3 4 5
4
1 2 4 4

Sample Output

2 1
2 0

Explanation

In the first test case:-
we can form the following pairs:
(1, 3), (2, 4) and 5 remains unpaired hence maximum pairs are 2
In second test case:-
(1, 4), (2, 4) are two pairs hence no pencil left unpaired

public class Test {
    public static void main(String[] args) {
          }

    static int[] solve(int[] arr) {
        // the value at first index of array to be returned is number of pairs
        // formed and value at second index is unpaired swords.
           }
}

what is default pakg in java

any one can tell what is special modifers in java.

Multi -level cache system design with different storage in each level.
Read Operation : – Minimum time to read a particular key from cache system. This should be followed by writing the key in all levels above it. Eg. if “key” is found at level ‘i’, add this key to cache present at 1 to i-1 level.

b. Write Operation: – Any write Operation should write in cache of all levels.

You can choose any algorithm for cache management like LRU, MRU.

https://codejamanalysis.wordpress.com/2017/03/18/crossover-problem-super-stack/

Any Optimized Solution to avoid TLE for 4 test cases. I have tried by implementing Stack using Doubly Linked List.
Still not able to pass test cases!!!

1. There is a list of 20 words. 10 of them are good works, and 10 of them are bad words. Write a regex of not more than 25 characters which would tell if given word is good or bad. Input would only contain one of these 20 words.
Good words: papa, book, home, cars, jolly, sugar, friend, mother, father, bloomiest
Bad words: ache, slow, torn, slum, boom, rival, wrong, cholera, revenge, arrogant

Input: book
Output: Good

Input: boom
Output: bad

Design a system like github.

What is the issue with this Producer Consumer Problem. Can you fix it.

public class ProducerConsumerProb {

	public static void main(String[] args) {
		Container container = new Container();
		Turn turn = Turn.PRODUCER;
		Producer p = new Producer(container, turn);
		Consumer c = new Consumer(container, turn);
		Thread pro = new Thread(p);
		Thread con = new Thread(c);
		pro.start();
		con.start();
	}

	public static class Producer implements Runnable{
		Container container;
		Turn turn;
		public Producer(Container integer,Turn turn) {
			this.container = integer;
			this.turn = turn;
		}
		
		@Override
		public void run() {
			for(int i=0;i<10;i++){
				Turn temp = null;
				while(true){
					synchronized (turn) {
						temp = turn;
					}
					if(temp == Turn.PRODUCER){
						break;
					}
				}
				synchronized (turn) {					
					container.setI(i);
					turn = Turn.CONSUMER;
				}
			}
		}
	}
	
	public static class Consumer implements Runnable{
		Container container;
		Turn turn;
		public Consumer(Container integer,Turn turn) {
			this.container = integer;
			this.turn = turn;
		}
		
		@Override
		public void run() {
			for(int i=0;i<10;i++){
				Turn temp = null;
				while(true){
					synchronized (turn) {
						temp = turn;
					}
					if(temp == Turn.CONSUMER){
						break;
					}
				}
				synchronized (turn) {					
					System.out.println(container.getI());
					turn  = Turn.PRODUCER;
				}
			}
		}
		
	}
	
	public static class Container{
		Integer i = new Integer(0);
		

		public int getI() {
			return i;
		}

		public void setI(int i) {
			this.i = i;
		}
				
	}
	
	enum Turn{
		PRODUCER,CONSUMER;
	}
}

There are hierarchy of class like super class and sub class. Yo have to make sure only one object can be create for any class using new keyword. How you implement the class.

List<Integer> list=Arrays.asList(1,2,3,4,5,6);
Iterator it=list.iterator();
while(it.hasNext()){
System.out.println(it.next());
}
The above code will iterate sequentially through 1 to 6. Can we iterate the same list alternatively so that it will print 1,3,5 without changing the while loop.

You are given a string S consisting of lowercase English letters denoting different types of candies. A substring of a string S is a string S' that occurs in S. For example, "bam" is a substring of "babammm". Each candy costs 1 unit. You can pick some continuous candies such that you can create a palindrome of length K by using some or all picked candies. Your task is to find the minimum cost to create a palindrome of length K.



Input Format:

First line contains string S.

Next line contains an integer T denoting the number of test cases.

Next T lines contain a single integer K.



Output Format:

For each test case, print minimum cost as mentioned above. If you cannot create a palindrome of length K then, simply print -1.



Constraints:
Constraints:

1≤|S|≤10^5
1≤T≤10
1≤K≤10^5



Sample Input
babammm
2
2
5
Sample Output
2
5
Explanation
Test Case 1: You can pick candies denoted by "mm" and create a palindrome of size 2. So the cost will be 2 units.

Test Case 2: You can pick candies denoted by "babam" and rearrange them, "bamab", to create a palindrome of size 5. So the cost will be 5 units.

Numbers with 4 are considered to be unlucky, floor numbers are skipped with numbers with 4; for a top level n, ask how many layers there are actually; for example n=20, that is 18 levels [Remove 4, 14]

Input unsorted integer array represents a list of coins,
find the minimum amount of money that cannot be formed by these coins, each coin can only be used once
     E.g. {1,1} -> 3, {1,2,4} -> 8

public TreeNode{
int val = val;
TreeNode left, right;
public TreeNode(int val){
this.val = val;
}
given a tree and an API, delete a part of the nodes in the tree and return the forest formed after the node is deleted.
public List<TreeNode> deletenodes(TreeNode root, List<TreeNode> toDeletes){

}
example

1
 / \
 2  3
/  / \
4  5 6
If you delete the 2 and 5 nodes, you will need to return to the forest
[4,     1]
         \
          3
           \
           6

Given: Collection of sorted (ascending) iterators which return integer value.
Implement hasNext() and next() methods in SuperIterator class that next() method should return sorted values from all iterators.
Note that we can't load all iterators to memory, because they might get values from big file (1TB for instance) and it will lead to OutOfMemoryError.

/*
    iter1: 1,  4,  5, 20, ...
    iter2: 2, 10, 12, 50, ...

    SuperIterator.next() method should return: 1, 2, 4, 5, 10, 12, 20, 50, ...
*/

interface Iterator {
    boolean hasNext();
    int next();
}

class SuperIterator {
    public SuperIterator(Collection<Iterator> iters) {
        
    }
    
    boolean hasNext() {
        //TODO
    }
    
    int next() {
        //TODO
    }
}

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.

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.

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

input: "kitten%20pic.jpg"
output: "kitten pic.jpg"

%20 -> ' '
%3A -> '?'
%3D -> ':'

modify your input in place.
no string library functions.

void Decode(char[] str)

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

Print a binary tree in vertical order using singly linked list...

find a points that has same distance to given three points

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.

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) {
        
    }
}

Design a dictionary with historical records
t0: hdict = HistoricalDict ()
t2: hdict.set ('foo', 1)
t4: hdict.set ('foo', 2)
t5: hdict.get ('foo', t5) -> 2
t6: hdict.get ('foo', t3) -> 1
t7: hdict.get ('foo', t0) -> None

CSS colors can be defined in the hexadecimal notation "#rgb", a shorthand for "#rrggbb". For example, "#03f" is equivalent to "#0033ff". Suppose the similarity between two colors "#abcdef" and "#ghijkl" is defined as (-(ab-gh)^2 - (cd-ij)^2 - (ef-kl)^2), write a function that accepts a color in the "#abcdef" format and returns a "#rgb" color that is most similar to the input. For example, given "#09f166", "#1e6" should be returned.

Given a binary tree, output the maximum EVEN sum along any path
      10
     /    \
    2      5
   /  \      \
  1   101    13
Maximum even sum = 101 +2 +10 + 5 = 118

convert a Sorted linkedList to complete BST

Given list of edge in the graph, find the number of reversed pairs,(1,2)
and (2,1) are such pair. Follow up: How to implement the distributed version.