CareerCup

Write a custom implementation of BlockingQueue using only intrinsic locking constructs in Java

Write a program to generate the anagrams of a word

Write a program to reverse a string

What is the output of following code snippet?

public static void main(String[] args){
    int[][] data = {{123},{4,5,6}};
    int[][] copy = data.clone();
    
    copy[0][0] = 100;
    
    System.out.println(data[0][0]);
    System.out.println(copy[0][0]);
    
    copy[1] = new int[]{300,400,500};
    
    System.out.println(data[1][1]);
    System.out.println(copy[1][1]);
 }

What would be the output of below code snippet?

class Super {
    int index = 5;
    public void printVal(){System.out.println("Super");}
}

class Sub extends Super {
    int index = 2;
    public void printVal(){System.out.println("Sub");}
}

public class OopTest {
    public static void main(String[] args){
        Super sup = new Sub();
        System.out.println(sup.index + " ");
        sup.printVal();
    }
}

Given a binary tree of integers, write code to store the tree into a list of integers and recreate the original tree from a list of integers.

Here's what your method signatures should look like (in Java):

List<Integer> store(Node root)
Node restore(List<Integer> list)

Example Tree:

5
/ \
3 2
/ / \
1 6 1

What would be the result of executing the below code snippet?

public class CountDownLatchDemo {
    public static void main(String[] args)throws InterruptedException {
        final CountDownLatch latch = new CountDownLatch(3);
        latch.countDown();
        latch.countDown();
        new Thread(){
            public void run(){
                try{
                    Thread.sleep(3000);
                }catch(InterruptedException ex){
                    ex.printStackTrace();
                }
                latch.countDown();
            };
        }.start();
        System.out.println("Before");
        latch.await();
        System.out.println("After");
    }
}

How many elements will the set object in the below snippet will contain after the program executes to last print statement?

public class ShortSetTest {
    public static void main(String[] args){
        Set shortSet = new HashSet();
        for(short i = 0; i < 100; i++){
            shortSet.add(i);
            shortSet.remove(i-1);
        }
        System.out.println(shortSet);
    }
}

Will the following class compile?

public class WildCardGeneric {
    private static void add(List<? extends Number> list){
        list.add(4);
        list.add(8);
        System.out.println(list.get(0));
    }
}

What would the output of the following snippet?

public class TrickyNum<X extends Number> {
    private X x;
    public TrickyNum(X x){
        this.x = x;
    }
    private double getDouble(){
        return x.doubleValue();
    }
    public static void main(String[] args) {
        TrickyNum<Integer> a = new TrickyNum<Integer>(new Integer(1));
        System.out.println(a.getDouble());
    }
}

What happens when you try to compile below class?

public class EnumTest {
    public EnumTest(){
        System.out.println("Inside Constructor");
    }
    public void printType(){
        enum PrinterType {DOT,INK,LASER}
    }
}

Given below code snippet, what would be the output?

public class DemoThread extends Thread {
    private int x = 2;
    public static void main(String[] args) throws Exception {
        new DemoThread().method();
    }
    public DemoThread(){
        System.out.println("test");
        x = 5;
        start();
    }
    public void method() throws Exception {
        join();
        x = x - 1;
        System.out.println(x);
    }
    public void run(){
        System.out.println("run");
        x *= 2;
    }
}

For code snippet given below, what would be the output?

String s8 = "AB";
        String s9 = s8.intern();
        if(s9.equals(s8) && s9 == s8)
            System.out.println("All Equal");
        if(s9.equals(s8) && s9!=s8)
            System.out.println("equals Equal");
        if(!s9.equals(s8) && s9==s8)
            System.out.println("== Equal");
        if(!s9.equals(s8) && s9!=s8)
            System.out.println("Nothing Equal");

Programming Exercise – FX Calculator
Your task is to create a console-based currency converter application.
Requirements
The application allows a user to convert an amount in a specific currency to the equivalent amount in another currency.
Your calculator should allow a user to enter an amount in any of the known currencies, and provide the equivalent amount in another currency.
Your calculator should parse console input like "<ccy1> <amount1> in <ccy2>", and provide a suitable response.
For example:
%> AUD 100.00 in USD
AUD 100.00 = USD 83.71
%> AUD 100.00 in AUD
AUD 100.00 = AUD 100.00
%> AUD 100.00 in DKK
AUD 100.00 = DKK 505.76
%> JPY 100 in USD
JPY 100 = USD 0.83
If the rate cannot be calculated, the program should alert the user:
%> KRW 1000.00 in FJD
Unable to find rate for KRW/FJD
When displaying amounts back to the user, they should be formatted with the precision given below:
AUD=2 decimal places

Our recommendation engine looks at the items that users buy together. For example, a user that buys Harry Potter 1 likely will buy Harry Potter 2.

Write a function that will output the largest item association given an input of item association pairs.

Example input:

[[Item1, Item2],
[Item2, Item3],
[Item2, Item4],
[Item5, Item6]]

Example output:

[Item1, Item2, Item3, Item4]

Write a function that returns true if the binary representation of an integer is a palindrome.

9 = 1001 = palindrome
8 = 1000 = not palindrome

Write a Program in Java, You have an Employee class |
class Employee{
String name;
Integer id,
Employee manager
}
Each employee has a manager and the manager of CEO is null. Find all direct and indirect reportees of a manager.
Eg. Say Employee e1 reports to CEO,
e2 and e3 reports to e1,
e4 and e5 reports to e2,
e6 reports to e3.
Then by giving e1 as input, output should be e2, e3, e4, e5 and e6.

import java.time.Duration;
import java.time.LocalTime;
import java.util.List;
import java.util.Map;

// Your goal is to write business logic for a very simple Restaurant booking system
// You are encouraged to refactor exisiting code, create other classes, write helper methods etc
// You also need to make sure that the implementation works correctly


class Reservation
{
    public String name;
    public int partySize;
    public LocalTime startTime;
}

class Table
{
    public int tableNumber;
    public int maxPartySize;       
}

class Restaurant
{
 
    public List<Table> tables;   
    public LocalTime openTime;
    public LocalTime closeTime;
    public Map<Integer, Duration> reservationDurationsPerPartySize;
    
    // Returns a Table if Reservation could be booked, null otherwise
    // Booking rules: 
    // 1) Reservation could be made only when the Restaurant is open.
    // 2) Only one Reservation can be seatted a Table at any time.
    // 3) Reservation can be seatted only at a Table of the same or a bigger size.
    // 4) Reservation should stay on the same Table for the whole Duration.
    // 5) Reservation Duration is determined by PartySize.


    public Table bookReservation(Reservation reservation) {
	//TODO:

}
}

Given set of N number of points/Co-ordinates[(x1,y1),(x2,y2), (x3,y3), (x4,y4), (x5,y5), etc] find if any of them form square.

You have L, a list containing some digits (0 to 9). Write a function answer(L) which finds the largest number that can be made from some or all of these digits and is divisible by 3. If it is not possible to make such a number, return 0 as the answer. L will contain anywhere from 1 to 9 digits. The same digit may appear multiple times in the list, but each element in the list may only be used once.

{{
Test cases
==========

Inputs:
(int list) l = [3, 1, 4, 1]
Output:
(int) 4311

Inputs:
(int list) l = [3, 1, 4, 1, 5, 9]
Output:
(int) 94311
}}

My Solution:
{{

package com.google.challenges;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;


public class Answer {
public static int answer(int[] l) {

// Your code goes here.
ArrayList<Integer> list0 = new ArrayList<>();
ArrayList<Integer> list1 = new ArrayList<>();
ArrayList<Integer> list2 = new ArrayList<>();
int sum =0;
Arrays.sort(l);
for(int i = 0; i<l.length; i++){
if(l[i] % 3 == 0){
list0.add(l[i]);
}else if(l[i] % 3 == 1){
list1.add(l[i]);
}else{
list2.add(l[i]);
}
sum += l[i];
}

if(sum%3==0){
StringBuilder strNum = new StringBuilder();
for(int i = l.length-1; i >= 0; i--)
{
strNum.append(l[i]);
}
return Integer.parseInt(strNum.toString());
}else if(sum%3 == 1){
if(list1.size()>0){
Collections.sort(list1);
list1.remove(0);
}else if(list2.size() >= 2){
Collections.sort(list2);
list2.remove(1);
list2.remove(0);
}else{
return -1;
}
}else if(sum%3 == 2){
if(list2.size()>0){
Collections.sort(list2);
list2.remove(0);
}else if(list1.size() >= 2){
Collections.sort(list1);
list1.remove(1);
list1.remove(0);

}else{
return -1;
}
}
list0.addAll(list1);
list0.addAll(list2);
StringBuilder strNum = new StringBuilder();
Collections.sort(list0);
for(int i = list0.size()-1; i >= 0; i--)
{
strNum.append(list0.get(i));
}
return strNum.length() > 0 ? Integer.parseInt(strNum.toString()) : -1;
}
}
}}

But here I am able to pass 4 test cases out of 5. Therefore I am looking for scenario which is left to check.
Can someone help me?

Alex has recently decided to learn about how to design compilers. As a first step he needs to find the number of different variables that are present in the given code.


So Alex will be provided N statements each of which will be terminated by a semicolon(;). Now Alex needs to find the number of different variable names that are being present in the given statement. Any string which is present before the assignment operator denotes to a variable name.

Input Format: :

The first line contains a single integer N


Each of the next N lines contains a single statement.

It is guaranteed that all the given statements shall be provided in a valid manner according to the format specified.

Output Format: :

Print the number of different variable name that are present in the given statements.


Sample Input
2
foo = 3;
bar = 4;
Sample Output
2
Explanation
Foo and Bar are only two variables used inside the statements so answer is 2.

Write a Code
Steve is going to throw a party at his place tonight.He needs to visit two shops near his home-the first shop is d1 meters away from his place,the second shop is d2 meters away from his place, and there are d3 meters between these two shops.Calculate the minimum distance he needs to walk to visit both both shops and return back home. Steve always start from his palce.He can only travel using these 3 routes.HE can use any route any amount of time necessary,the only thing he needs to achieve is the minimum distance.
Find the minimum distance Steve has to walk to visit both shops and return home.
input: 1,1,1
output: 4
input: 10,20,30
output: 60

Write a Java Program in which a class takes four integer arguments as input(a, b, c and d). Do addition of (a+b) on one thread, addition of (c+d) on another thread and multiplication of(a+b) * (c+d)) on main thread.
Like: Thread1 = (a+b)
Thread2 = (c+d)
Main Thread = (Thread1 * Thread2)

LinkedList Reverse

Given a string, find the longest substring with k distinct characters.

e.g - “aaaabbbb”, k = 2, “aaaabbbb”
“asdfrttt” k = 3, “asd”, “frttt”

[Telephonic Question]

input = 8
output =
1 1 1 1 1 1 1 2
3 2 2 2 2 2 2 2
3 3 3 3 3 3 3 4
5 4 4 4 4 4 4 4
5 5 5 5 5 5 5 6
7 6 6 6 6 6 6 6
7 7 7 7 7 7 7 8

import java.util.*;
class Test 
{
	int n;
	Scanner sc;
	void readNumber()
	{
	    sc=new Scanner(System.in);
            n = sc.nextInt();
	}
	void printPattern()
	{                  
	    // write your logic here 

	}
	public static void main(String[] args) 
	{
        Test t = new Test();
		t.readNumber();
		t.printPattern();
	}
}

Object Oriented Design Problem

--------------------------------

Design an OO parking lot. What classes and functions will it have. It should say, full, empty and also be able to find spot for Valet parking. The lot has 3 different types of parking: regular, handicapped and compact.


Use Case:

1. Customer are given a ticket that they can use to redeem to get their vehicle back 

2. Parking spots come in three sizes, small, med, large 

3. Thee types of vehicles, small[Two Wheeler], med[Car], large[Bus] 

    -a small vehicle can park in a small, medium, and large spot 

    -a medium vehicle can park in a medium and large spot 

    -a large vehicle can park in a large spot

4. There are multiple entry gate to park vehicle. So Vehicle should asign nearest posible parking spot

You are given an array of integers. Find the minimum difference between two prime numbers(Positive or negative) in the array when present with minimum time complexity and provide the test data to test the this code.

Remove 3 consecutive duplicates from string.
INPUT:aabbbaccddddc
OUTPUT:cdc

Situation - You have millions of records(Strings) and user is typing "abc" in search box . Your task is to display strings from records in the sequence.

e.g String in the record contain "abc" starting should appear first, then string which has "abc" in the second, should apprear later as below.

String - fabcsdf,asdfabc,dfadsfsdfabc,abckdf,ddfabc...

Displays suggestion like....
abckdf
fabcsdf
ddfabc
asdfabc
dfadsfsdfabc

Question - Which data structure you would use to stor this ?
And how will you implement to get this(shorted) result