Solved

userCompare  challenge

Posted on 2016-08-30
3
88 Views
Last Modified: 2016-09-02
Hi,


i am working one below challenge
http://codingbat.com/prob/p143482

i was not clear on below description

We have data for two users, A and B, each with a String name and an int id. The goal is to order the users such as for sorting. Return -1 if A comes before B, 1 if A comes after B, and 0 if they are the same. Order first by the string names, and then by the id numbers if the names are the same. Note: with Strings str1.compareTo(str2) returns an int value which is negative/0/positive to indicate how str1 is ordered to str2 (the value is not limited to -1/0/1). (On the AP, there would be two User objects, but here the code simply takes the two strings and two ints directly. The code logic is the same.)
what is A and what is B here to sort??

how below results are -1 and 1 and 0 please advise
userCompare("bb", 1, "zz", 2) → -1
userCompare("bb", 1, "aa", 2) → 1
userCompare("bb", 1, "bb", 1) → 0
0
Comment
Question by:gudii9
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 28

Accepted Solution

by:
Bill Bach earned 250 total points
ID: 41778354
You really need to read the entire description carefully.  If you are going to be a coder, you must have a mind for details.

>what is A and what is B here to sort??
If you look at the code window on that page, you will see:
   public int userCompare(String aName, int aId, String bName, int bId)
The first two fields are the string and integer for A, and the second two fields are the string and integer for B.  You are not sorting them, but only comparing them.

>how below results are -1 and 1 and 0 please advise
In the first example, the string for A is less than the string for B, so it returns -1.
In the second example, the string for A is more than the string for B, so it returns 1.
In the third example, the string for A is the same as the string for B, so it then compares the integer fields.  The integer fields are the same, so it returns 0.

This is stated in the problem just as clearly:
Return -1 if A comes before B,
[return] 1 if A comes after B, and
[return] 0 if they are the same.
Order first by the string names, and then by the id numbers if the names are the same.
0
 
LVL 84

Assisted Solution

by:ozo
ozo earned 250 total points
ID: 41779284
public int userCompare(String aName, int aId, String bName, int bId) {
  return (int)Math.signum(2*Math.signum(aName.compareTo(bName))+Math.signum(aId-bId));
}
0
 
LVL 7

Author Comment

by:gudii9
ID: 41782484
public int userCompare(String aName, int aId, String bName, int bId) {
  int res=aName.compareTo(bName);
  if(aName.equals(bName)&&(aId==bId)){
    return 0;
  }
  if(res>0){
    return 1;
    
  }else if(res<0){
    return -1;
    
  }else if(aId>bId){
    return 1;
    
  }else 
    return -1;
    
  
  
}

Open in new window


above also passed all tests. Any improvements or alternate approaches?
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
Basic understanding on "OO- Object Orientation" is needed for designing a logical solution to solve a problem. Basic OOAD is a prerequisite for a coder to ensure that they follow the basic design of OO. This would help developers to understand the b…
This tutorial will introduce the viewer to VisualVM for the Java platform application. This video explains an example program and covers the Overview, Monitor, and Heap Dump tabs.
With the power of JIRA, there's an unlimited number of ways you can customize it, use it and benefit from it. With that in mind, there's bound to be things that I wasn't able to cover in this course. With this summary we'll look at some places to go…

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question