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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone {
  9.  
  10. 	private static int defaultStep = 2;
  11.     private static int defaultIndex = defaultStep;
  12.  
  13. 	public static void main (String[] args) throws java.lang.Exception {
  14.         List<Integer> list= new ArrayList<>(Arrays.asList(1, 2, 3, 4, 5));
  15.         List<Integer> result = reformatList(list, defaultIndex);
  16.  
  17.         System.out.println("result: " + result);
  18.     }
  19.  
  20.  
  21.     static List<Integer> reformatList(List<Integer> list, int idx) {
  22.         //System.out.println("Size: " + list.size() + ", index: " + idx);
  23.         int listSize = list.size();
  24.         if (idx > listSize)
  25.             return reformatList(list, idx - listSize);
  26.  
  27.         List<Integer> newList = new ArrayList<>();
  28.  
  29.         if (idx == 0) {
  30.             newList.addAll(list.subList(idx + 1, listSize));
  31.         }
  32.  
  33.         if (idx != 0) {
  34.             newList.addAll(list.subList(idx, listSize));
  35.             newList.addAll(list.subList(0, idx - 1));
  36.         }
  37.  
  38.         int newListSize = newList.size();
  39.         if (newListSize > 1) {
  40.             idx = (newListSize < defaultStep) ? defaultStep - newListSize : defaultStep;
  41.             return reformatList(newList, idx);
  42.         }
  43.  
  44.         return newList;
  45.     }
  46. }
Success #stdin #stdout 0.12s 320576KB
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result: [3]
https://ideone.com/fs0RYg
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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