Solved

endX challenge

Posted on 2016-09-21
2
81 Views
Last Modified: 2016-09-22
Hi,

I am working on below challenge.
http://codingbat.com/prob/p105722
Psedo code:
1. check the array length 0  or 1 then retun same str
2.else return string with * in between for repeated pair of characters

I wrote my code as below and not passing all tests
public String endX(String str) {
  CharSequence cs="x";
  if(!str.contains(cs)){
    return str;
  }
  return null;
}

Open in new window


I am failing some tests.
Expected      Run            
endX("xxre") → "rexx"      null      X      
endX("xxhixx") → "hixxxx"      null      X      
endX("xhixhix") → "hihixxx"      null      X      
endX("hiy") → "hiy"      "hiy"      OK      
endX("h") → "h"      "h"      OK      
endX("x") → "x"      null      X      
endX("xx") → "xx"      null      X      
endX("") → ""      ""      OK      
endX("bxx") → "bxx"      null      X      
endX("bxax") → "baxx"      null      X      
endX("axaxax") → "aaaxxx"      null      X      
endX("xxhxi") → "hixxx"      null      X      
other tests
X      

Any improvements or alternate approaches?      

please advise
0
Comment
Question by:gudii9
  • 2
2 Comments
 
LVL 37

Accepted Solution

by:
zzynx earned 500 total points
ID: 41810201
>> 1. check the array length 0  or 1 then retun same str
Where is that in your code???????

>> 2.else return string with * in between for repeated pair of characters
You're mixing up with another challenge. Why don't you try to do one by one?

This works:
public String endX(String str) {
  if (str.length()==0 || str.length()==1) {
    return str;
  }
  
  if (str.startsWith("x")) {
     return endX(str.substring(1)) + "x";
  }
  return str.substring(0,1) + endX(str.substring(1));
}

Open in new window


Try to find out for yourself why.
0
 
LVL 37

Expert Comment

by:zzynx
ID: 41810214
Again,
if (str.length()==0 || str.length()==1) {

Open in new window

can be replaced with
if (str.length()<2) {

Open in new window

0

Featured Post

DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

Question has a verified solution.

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

Introduction This article is the first of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article explains our test automation goals. Then rationale is given for the tools we use to a…
Computer science students often experience many of the same frustrations when going through their engineering courses. This article presents seven tips I found useful when completing a bachelors and masters degree in computing which I believe may he…
The viewer will learn how to implement Singleton Design Pattern in Java.

832 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