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  1. package myJava;
  2.  
  3. import java.util.ArrayDeque;
  4.  
  5. class SlidingWindow {
  6.  
  7. 	int[] maxsDeque(int[] arr, int k) {
  8.  
  9. 		//Bounds check
  10. 		if( k > arr.length || k < 1)
  11. 			return new int[]{};
  12.  
  13. 		int windows = arr.length - k + 1; //number of windows
  14.  
  15. 		ArrayDeque<Integer> deck = new ArrayDeque<Integer>();
  16. 		int[] maximums = new int[windows];
  17.  
  18. 		for (int i = 0; i < arr.length; i++) {
  19. 			if( i >= k )
  20. 				maximums[i-k] = arr[deck.getFirst()];
  21.  
  22. 			while (!deck.isEmpty() && arr[i] >= arr[deck.getLast()])
  23. 				deck.pollLast();
  24. 			while (!deck.isEmpty() && deck.getFirst() <= (i-k))
  25. 				deck.pollFirst();
  26. 			deck.addLast(i);
  27. 		}
  28. 		maximums[windows-1] = arr[deck.getFirst()];
  29. 		return maximums;
  30. 	}
  31.  
  32. }
  33.  
  34.  
  35. import static org.junit.Assert.*;
  36. import org.junit.Before;
  37. import org.junit.BeforeClass;
  38. import org.junit.Test;
  39.  
  40. public class SlidingWindowTest {
  41.  
  42. 	SlidingWindow win;
  43.  
  44. 	@Before
  45. 	public void setUp() throws Exception {
  46. 		win = new SlidingWindow();
  47. 	}
  48.  
  49. 	@Test
  50. 	public void testMaxsDeque() {
  51. 		assertArrayEquals(
  52. 				new int[]{11,6,6,9,9,9,8,15}, 
  53. 				win.maxsDeque(new int[]{ 11, -2, 5, 6, 0, 9, 8, -1, 2, 15 }, 3));		
  54.  
  55. 		assertArrayEquals(
  56. 				new int[]{6,6,9,9,9,8,15}, 
  57. 				win.maxsDeque(new int[]{ -2, 5, 6, 0, 9, 8, -1, 2, 15 }, 3));
  58.  
  59. 		assertArrayEquals(
  60. 				new int[]{500}, 
  61. 				win.maxsDeque(new int[]{ 500 }, 1));	
  62.  
  63. 		assertArrayEquals(
  64. 				new int[]{6,6,6}, 
  65. 				win.maxsDeque(new int[]{ 6,6,6 }, 1));
  66. 		assertArrayEquals(
  67. 				new int[]{6}, 
  68. 				win.maxsDeque(new int[]{ 6,6,6 }, 3));
  69.  
  70. 		assertArrayEquals(
  71. 				new int[]{}, 
  72. 				win.maxsDeque(new int[]{ 6 }, 2));
  73. 		assertArrayEquals(
  74. 				new int[]{}, 
  75. 				win.maxsDeque(new int[]{ 6 }, 0));
  76. 	}
  77.  
  78. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
Warning: Binary file SlidingWindow contains myJava.SlidingWindow
spoj: The program compiled successfully, but main class was not found.
      Main class should contain method: public static void main (String[] args).
stdout
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Standard output is empty
https://ideone.com/t2VLUk
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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