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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. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		int[]data = {1,2,5,6,4,7};
  13. 		prevPermutation(data);
  14. 		System.out.println(Arrays.toString(data));
  15. 	}
  16. 	public static void prevPermutation(int[]data){
  17.      for(int i = data.length - 2; i >= 0; i--){
  18.          if(data[i] > data[i + 1]){
  19.             int index = i + 1;
  20.             for(int j = i + 2; j < data.length; j++){
  21.                 if (data[j] > data[index] && data[j] < data[i]){
  22.                      index = j;
  23.                 }
  24.             }
  25.             int tmp = data[i];
  26.             data[i] = data[index];
  27.             data[index] = tmp;
  28.             sortDescending(data, i + 1, data.length);
  29.             break; 
  30.          }
  31.      }
  32.  
  33. 	}
  34. 	public static void sortDescending(int[]data, int from, int to){
  35. 	     int l = to - from;
  36. 	     for(int i = 0; i < l/2; i++){
  37. 	     	  int tmp = data[i + from];
  38. 	          data[i + from] = data[to - i - 1];
  39. 	          data[to - i - 1] = tmp;
  40. 	     }         
  41. 	}
  42. }
Success #stdin #stdout 0.06s 32524KB
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Standard input is empty
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[1, 2, 5, 4, 7, 6]
https://ideone.com/RvmymX
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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