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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. import java.util.stream.*;
  7. import java.util.function.*;
  8.  
  9. /* Name of the class has to be "Main" only if the class is public. */
  10. class Ideone
  11. {
  12. 	private static List<String> skipElements1(List<String> elements, Set<String> elementsToDelete) {
  13. 		ListIterator<String> iterator = elements.listIterator();
  14. 		String element;
  15. 		while (iterator.hasNext()) {
  16. 		        element = iterator.next();
  17. 		        if (element.equals("D")) {
  18. 		                iterator.previous();
  19. 		                iterator.add("G");
  20. 		                iterator.next();
  21. 		        }
  22.  
  23. 		        if (elementsToDelete.contains(element)) {
  24. 		                iterator.remove();
  25. 		        }
  26. 		}
  27. 		return elements;
  28. 	}
  29.  
  30. 	private static List<String> skipElements2(List<String> inputElements, Set<String> elementsToDelete) {
  31. 		return inputElements.stream()
  32. 	    	.flatMap(entry -> "D".equals(entry) ? Stream.of("G", entry) : Stream.of(entry))
  33. 	    	.filter(Predicate.not(elementsToDelete::contains)).collect(Collectors.toList());        
  34. 	}
  35.  
  36. 	static void test(int testId, List<String> inputElements, Set<String> skipElements) {
  37. 	    List<String> result1; 
  38. 	    List<String> result2; 
  39. 		try {
  40.     	    List<String> workCopy = new ArrayList(inputElements);	
  41.     	    result1 = skipElements1(workCopy, skipElements);
  42. 		} catch(Exception e) {
  43. 			System.err.println(String.format("Test %d failed in ver1 - %s", testId, e));
  44. 			return;
  45. 		}
  46.  
  47. 		try {
  48.     	    List<String> workCopy = new ArrayList(inputElements);	
  49.     	    result2 = skipElements2(workCopy, skipElements);
  50. 		} catch(Exception e) {
  51. 			System.err.printf("Test %d failed in ver2 - %s\n", testId, e);
  52. 			return;
  53. 		}
  54.  
  55. 		boolean equal = result1.toString().equals(result2.toString());
  56. 		if (equal) {
  57. 			System.out.printf("Test %d: OK\n", testId);
  58. 		} else {
  59. 			System.out.printf("Test %d: failed (%s <> %s)\n", testId, result1, result2);
  60. 		}
  61. 	}
  62.  
  63. 	public static void main (String[] args) throws java.lang.Exception
  64. 	{
  65. 		Set<String> elementsToDelete = Set.of("A", "C", "E");
  66.  
  67. 		List<String> elements = Stream.of("A", "B", "C", "D", "E")
  68. 		        .collect(Collectors.toCollection(LinkedList::new));
  69.  
  70. 		test(1, List.of("A", "B", "C", "D", "E"), Set.of("A", "C", "E"));        
  71. 		test(2, List.of("D", "A", "B", "C", "D", "E"), Set.of("A", "C", "E"));        
  72. 		test(3, List.of("A", "B", "C", "D", "E"), Set.of("A", "C", "E", "D"));        
  73. 		test(4, List.of("D", "E"), Set.of("A", "C", "E"));        
  74. 		test(5, List.of("E", "D"), Set.of("A", "C", "E"));        
  75. 		test(6, Collections.emptyList(), Set.of("A", "C", "E"));        
  76. 		test(7, List.of("D"), Set.of("A", "C", "E"));        
  77. 		test(8, List.of("D", "D"), Set.of("A", "C", "E"));        
  78. 		test(9, List.of("D", "D", "D"), Set.of("A", "C", "E"));        
  79.    }
  80. }
Success #stdin #stdout 0.09s 49104KB
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stdin
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Standard input is empty
stdout
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Test 1: OK
Test 2: OK
Test 3: OK
Test 4: OK
Test 5: OK
Test 6: OK
Test 7: OK
Test 8: OK
Test 9: OK
https://ideone.com/1XDbln
language:
Java (HotSpot 12)
created:
2 years ago
visibility:
public

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