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  1. package test;
  2.  
  3. import org.junit.Assert;
  4. import org.junit.Test;
  5.  
  6.  
  7. public class TestHomework {
  8. 	public static interface Homework2{		
  9. 		public String encode(String input);
  10. 		public String decode(String input);		
  11. 	}
  12.  
  13. 	public static class Homework2ImpleA implements Homework2{
  14. 		int sep;			
  15.  
  16. 		public Homework2ImpleA(int sep){
  17. 			this.sep=sep;			
  18. 		}
  19.  
  20. 		char[][] buildContainer(int inputsize ){
  21.  
  22. 			char[][] rs= new char[this.sep][];
  23. 			int d = (inputsize / this.sep);
  24. 			int m = (inputsize % this.sep);						 
  25. 			for(int i=0,j=m+this.sep-1;i<this.sep;i++,j--){
  26. 				rs[i]=new char[d+Math.max((j/this.sep),0)];
  27.  
  28. 			} 						
  29. 			return rs;
  30. 		}
  31.  
  32. 		String outputContainer(char[][] container){
  33. 			StringBuilder rs = new StringBuilder();
  34. 			for(char[] co : container){
  35. 				rs.append(new String(co));
  36. 			}
  37. 			return rs.toString();
  38. 		}								
  39. 		public String encode(String input){			
  40. 			char [] o = input.toCharArray();
  41. 			char[][] container=buildContainer(o.length);		
  42. 			for(int i=0,p=(i/this.sep);i<o.length;i+=this.sep,p=(i/this.sep)){
  43. 				for(int j=0,cp=i+j;j<this.sep && cp <o.length;j++,cp=i+j){
  44. 					if(p<container[j].length){
  45. 						container[j][p] = o[cp];
  46. 					}										
  47. 				}
  48. 			}
  49. 			return outputContainer(container);
  50. 		}
  51. 		public String decode(String input){			
  52. 			char [] o = input.toCharArray();
  53. 			char[][] container=buildContainer(o.length);						
  54. 			for(int i=0,os=0;i<this.sep;i++){
  55.  
  56. 				System.arraycopy(o, os, container[i], 0, container[i].length);
  57. 				os+=container[i].length;
  58. 			}
  59.  
  60. 			for(int i=0;i<container.length;i++){
  61. 				for(int j=0 ;j<container[i].length;j++){
  62. 					o[(j*sep)+i]=container[i][j];
  63. 				}
  64. 			}
  65.  
  66. 			return new String(o);
  67. 		}			
  68. 	}
  69.  
  70.  
  71. 	@Test
  72. 	public void doHomework(){
  73. 		Homework2 t = new Homework2ImpleA(2);
  74. 		for(String [] str : new String[][]{
  75. 				{"135246","123456"}
  76. 				,{"acebd","abcde"}
  77. 				,{"wrdol","world"}
  78. 				}){
  79. 			String test = str[0];
  80. 			String check = str[1];	
  81. 			String decode = t.decode(test);
  82. 			System.out.printf("%s : %s ==  %s \n",test,check,decode);
  83. 			Assert.assertEquals(check, decode);			
  84. 		}			
  85. 	}
  86.  
  87. 	@Test
  88. 	public void doHomework2_2(){
  89. 		Homework2 t = new Homework2ImpleA(2);
  90. 		for(String [] str : new String[][]{
  91. 				{"123456","135246"}
  92. 				,{"abcde","acebd"}
  93. 				,{"world","wrdol"}
  94.  
  95. 				}){
  96. 			String test = str[0];
  97. 			String check = str[1];
  98. 			String encode = t.encode(test);
  99. 			String decode = t.decode(encode);
  100. 			System.out.printf("%s,%s,%s,%s\n",test,check,encode,decode);
  101. 			Assert.assertEquals(check, encode);		
  102. 			Assert.assertEquals(test, decode);	
  103. 		}		
  104. 	}	
  105.  
  106. 	@Test
  107. 	public void doHomework2_3(){
  108. 		Homework2 t = new Homework2ImpleA(3);
  109. 		for(String [] str : new String[][]{
  110. 				{"123456","142536"}
  111. 				,{"abcde","adbec"}
  112. 				,{"world","wlodr"}				
  113. 				}){
  114. 			String test = str[0];
  115. 			String check = str[1];
  116. 			String encode = t.encode(test);
  117. 			String decode = t.decode(encode);
  118. 			System.out.printf("%s,%s,%s,%s\n",test,check,encode,decode);
  119. 			Assert.assertEquals(check, encode);		
  120. 			Assert.assertEquals(test, decode);	
  121. 		}		
  122. 	}	
  123.  
  124. 	@Test
  125. 	public void doHomework2_4(){
  126. 		Homework2 t = new Homework2ImpleA(4);
  127. 		for(String [] str : new String[][]{
  128. 				{"1234","1234"}
  129. 				,{"12345","15234"}
  130. 				,{"123456","152634"}				
  131. 				,{"1234567","1526374"}
  132. 				,{"12345678","15263748"}
  133. 				,{"123456789","159263748"}
  134. 				}){
  135. 			String test = str[0];
  136. 			String check = str[1];
  137. 			String encode = t.encode(test);
  138. 			String decode = t.decode(encode);
  139. 			System.out.printf("%s,%s,%s,%s\n",test,check,encode,decode);
  140. 			Assert.assertEquals(check, encode);		
  141. 			Assert.assertEquals(test, decode);	
  142. 		}		
  143. 	}	
  144.  
  145. }
  146.  
Success #stdin #stdout 0.07s 380224KB
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https://ideone.com/Hkb8j4
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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