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POjava- "-1" position
 

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  1. POjava- "-1" position
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    <p>I have this question:</p> <p>The method accepts an integer array as its input and returns a new array which is a permutation of the input array. The method fix34 rearranges the input array such that every 3 is immediately followed by a 4 (e.g. if there is a 3 at position i, there will be a 4 at position i+1). The method keeps the original positions of the 3s but may move any other number, moving the minimal amount of numbers. Assumptions regarding the input: </p> <ul> <li>The array contains the same number of 3's and 4's (for every 3 there is a 4)</li> <li>There are no two consecutive 3s in the array</li> <li>The matching 4 for a 3 at some position i is at position j where j > i </li> </ul> <p>ok, so this is what I wrote:</p> <pre><code>public class Fix34 { public static void main(String[] args){ int [] args1 ={3,1,2,3,5,4,4}; int[] args11=fix34(args1); for (int i = 0; i&lt;=args11.length-1;i++ ){ System.out.print(args11[i]+" ");}} public static int pos (int[] arr){ int i= arr.length-1; while (arr[i]!=4){ i=-1; } return i; } public static int[] fix34(int[] nums){ for(int i = 0; i&lt;=nums.length-1; i++){ if (nums[i] == 3){ nums[pos(nums)]=nums[i+1]; nums[i+1]=4; } } return nums; } } </code></pre> <p>when I insert arrays such {3,2,1,4} it works, but with the array as written in the code, it gives me the error message:</p> <pre><code>Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -1 at Fix34.pos(Fix34.java:15) at Fix34.fix34(Fix34.java:25) at Fix34.main(Fix34.java:6) </code></pre> <p>how come the arrays gets to -1 position?!</p> <p>Thanks</p>
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    1. USMat
    1. USUnknown user
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      1. USDeepak
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    1. COChange `i=-1;`to `i-=1;`.
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      1. USst0le
    2. COoh thanks.. :) now it works. silly me.
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      1. USUnknown user
    3. COJust accept the answer and keep learning. Come back when you need more help. Thanks for shopping Stack Overflow.
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      1. USErick Robertson
 

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