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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. 		// your code goes here
  13. 	}
  14. }
  15.  
  16. class Solution {
  17. 	public ArrayList<Integer> wave(ArrayList<Integer> A) {
  18. 	    ArrayList<ComparableInt> waveComp = new ArrayList<>();
  19. 	    for (int i = 1; i < A.size(); i++) {
  20. 	        if (i % 2 == 0) { waveComp.add(new ComparableInt(A.get(i-1), true)); }
  21. 	        else { waveComp.add(new ComparableInt(A.get(i-1), false)); }
  22. 	    }
  23. 	    Collections.sort(waveComp);
  24. 		List<Integer> order = waveComp.stream().map(ComparableInt::getNum).collect(Collectors.toList());
  25. 	    return A;
  26. 	}
  27. }
  28.  
  29. class ComparableInt implements Comparable<ComparableInt> {
  30.     Integer num;
  31.     Boolean reverse;
  32.  
  33.     ComparableInt(Integer num, boolean reverse) {
  34.         this.num = num;
  35.         this.reverse = reverse;
  36.     }
  37.  
  38.     public Integer getNum() { return num; }
  39.  
  40.     public int compareTo(ComparableInt other) {
  41.         if (reverse) return other.getNum().compareTo(num);
  42.         return num.compareTo(other.getNum());
  43.     }
  44. }
  45.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
Main.java:24: error: cannot find symbol
		List<Integer> order = waveComp.stream().map(ComparableInt::getNum).collect(Collectors.toList());
		                                                                           ^
  symbol:   variable Collectors
  location: class Solution
1 error
stdout 
Standard output is empty
https://ideone.com/RVtAos
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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