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array6 challenfge

Posted on 2016-09-15
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Last Modified: 2016-09-18
Hi,

I am working on below challenge.
http://codingbat.com/prob/p108997
Psedo code:
1. create new array of the portion of original array length
2. fill new array with rest of the elements
3. check to see if it has 6 if yes return true if no return false
4. retrun above boolean

I wrote my code as below
public boolean array6(int[] nums, int index) {
  int len=nums.length-index;
  int[] num=new int[len];
  //fill without using for loop but recursive way
    if(num.length==0){
    return false;
  }
  if(num.length==1&&!num.contains(6)){
    return false;
  }
   if(num.length==1&&num.contains(6)){
    return true;
  }
 
  
  return null;
}

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Question by:gudii9
  • 3
  • 2
6 Comments
 
LVL 28

Assisted Solution

by:rrz
rrz earned 1000 total points
ID: 41800152
Why do you feel the need to create a new array?
You are trying to use a method named contains.  Can you point to it in the API?
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LVL 35

Accepted Solution

by:
sarabande earned 1000 total points
ID: 41800270
since the challenge is to use a recursive approach, you need to

- check if index >= array size
- if yes, return false
- check if nums[index] == 6
- if yes, return true,
- return array6 function call passing nums and index+1
.

if you do so for [3, 5, 6, 0, 4], then the recursive calls are

array6(nums, 0)
array6(nums, 1)
array6(nums, 2) ==> return true

Sara
0
 
LVL 7

Author Comment

by:gudii9
ID: 41804119
java 8 has below lamda for each method but coding bat do not support

public boolean array6(int[] nums, int index) {
 IntStream.of(nums).anyMatch(x -> x == 6);
}
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LVL 7

Author Comment

by:gudii9
ID: 41804122
public boolean array6(int[] nums, int index) {
  if(index>nums.length()){
    return false;
  }
    else if(nums[index]==6){
      return true;
    }
    else return arrays6[nums,index+1];
  }





/*- check if index >= array size
- if yes, return false
- check if nums[index] == 6
- if yes, return true,
- return array6 function call passing nums and index+1*/

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above gives below error.

Compile problems:


Error:      else return arrays6[nums,index+1];
                              ^
Syntax error on token ",", . expected


see Example Code to help with compile problems
please advise
0
 
LVL 7

Author Comment

by:gudii9
ID: 41804124
public boolean array6(int[] nums, int index) {
  if(index>=nums.length){
    return false;
  }
    else if(nums[index]==6){
      return true;
    }
    else return array6(nums,index+1);
  }

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above passed all tests.
any improvements or alternate approaches?
0
 
LVL 28

Expert Comment

by:rrz
ID: 41804138
Your code is good.   My personal preference is to omit the elses.
public boolean array6(int[] nums, int index) {
  if(index>=nums.length){
    return false;
  }
  if(nums[index]==6){
    return true;
  }
  return array6(nums,index+1);
}

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