CareerCup

Which of the following creates a List of 3 visible items and multiple selections abled?

a) new List(false, 3)
b) new List(3, true)
c) new List(true, 3)
d) new List(3, false)

Answer : b

Which of the following tool is used to generate API documentation in HTML format from doc comments in source code?

a) javap tool
b) javaw command
c) Javadoc tool
d) javah command

Answer : c

What does the expression float a = 35 / 0 return?

a) 0
b) Not a Number
c) Infinity
d) Run time exception

Answer : c

Which of the following is a valid long literal?

a) ABH8097
b) L990023
c) 904423
d) 0xnf029L

Answer : d

What is the return type of the hashCode() method in the Object class?

a) Object
b) int
c) long
d) void

Answer : b

Which of the following is a valid declaration of a char?

a) char ch = '\utea';
b) char ca = 'tea';
c) char cr = \u0223;
d) char cc = '\itea';

Answer : a

_____ is used to find and fix bugs in the Java programs.

a) JVM
b) JRE
c) JDK
d) JDB

Answer : d

The \u0021 article referred to as a

a) Unicode escape sequence
b) Octal escape
c) Hexadecimal
d) Line feed

Answer : a

Which of the following is not a Java features?

a) Dynamic
b) Architecture Neutral
c) Use of pointers
d) Object-oriented

Answer : c

Which of the following option leads to the portability and security of Java?

a) Bytecode is executed by JVM
b) The applet makes the Java code secure and portable
c) Use of exception handling
d) Dynamic binding between objects

Answer : a

Java:
Managing extreme sports locations:
In such locations, are period of the year when this actities can be performed(ski December - February, Kiting May August, ATV all year), each sport /location usually has an average cost/day.
The sports have hierarcal structure and countaind the country, region and city, we need an ADD, REMOVE, UPDATE; GET a location and all its informations.
exemple:
Switzerland:
Zurich:sky(dec, feb), price 12 $
Berna:ATV - all time , price 10$

N number of balloons are kept at different heights. You are asked to find out number of arrows to burst them. When an arrow hits the balloon it goes one level down.
Assume that the balloons are having same size.

for example given the balloons heights as array(Array will be given in decreasing order of size) :
5 4 3 3 2 2 1 1 1
minimum number of arrows to shoot them is: 3

explanation:
using first arrow shoot: 5 4 3 2 1
using second arrow shoot: 3 2 1
using third arrow shoot: 1

Example 2:
5 4 2 1

minimum number of arrows to shoot them is: 2
using first arrow shoot: 5 4
using second arrow shoot: 2 1

Expecting the solution to be in O(1) space complexity.

You are required to collect N numbers from a bag. Initially, the bag is empty. Whenever you put a number X in the bag, then the owner of the bag asks the question.

The questions are as follows:

. What is the greatest integer that is smaller than X and present inside the bag?

. What is the smallest number that is greater than X and present inside the bag?

If you answer both the questions correctly, then you can put X inside the bag. Your task is to answers the questions that are asked by the owner of the bag. If no such numbers exist in the bag print -1.



Example:
5 (Number of elements in the bag)
1
4
2
3
7


output:
-1 -1
1 -1
1 4
2 4
4 -1

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
    }
}