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  1. import java.lang.*;
  2.  
  3. class MP26
  4. {
  5. 	public static void main (String[] args)
  6. 		throws java.lang.Exception
  7. 	{
  8. 		int[][] A={{1,0,0},{0,1,0},{0,0,1},{1,0,1}};
  9. 		int[][] B={{1,2},{3,4},{5,6}};
  10. 		int[][] C = Matrix.valueOf(A).multiply(Matrix.valueOf(B)).getArray();
  11.  
  12. 		java.lang.System.out.println(Matrix.toString(C));
  13. 	}
  14.  
  15. 	private static class Matrix
  16. 	{
  17. 		private final int[][] array;
  18. 		private final int row;
  19. 		private final int col;
  20.  
  21. 		private Matrix (int[][] array)
  22. 		{
  23. 			this.array = array;
  24. 			this.row = array.length;
  25. 			this.col = array[0].length;
  26. 		}
  27.  
  28. 		static boolean isMatrix (int[][] array)
  29. 		{
  30. 			if (array == null) 
  31. 			{
  32. 				return false;
  33. 			}
  34.  
  35. 			int col = -1;
  36. 			for (int[] line : array)
  37. 			{
  38. 				if (line == null) 
  39. 				{
  40. 					return false;
  41. 				}
  42.  
  43. 				if (col < 0)
  44. 				{
  45. 					col = line.length;
  46. 				}
  47. 				else if (col != line.length)
  48. 				{
  49. 					return false;
  50. 				}
  51. 			}
  52.  
  53. 			if (col < 1)
  54. 			{
  55. 				return false;
  56. 			}
  57.  
  58. 			return true;
  59. 		}
  60.  
  61. 		Matrix multiply (Matrix B) throws MatrixException
  62. 		{
  63. 			if (B == null)
  64. 			{
  65. 				throw new NullArgumentException("B");
  66. 			}
  67.  
  68. 			if (col != B.row)
  69. 			{
  70. 				throw new MatrixException("Unmatch size of B.row");
  71. 			}
  72.  
  73. 			int[][] C = new int[row][B.col];
  74. 			for (int i = 0; i < row; ++i)
  75. 			{
  76. 				for (int j = 0; j < B.col; ++j)
  77. 				{
  78. 					for (int k = 0; k < col; ++k)
  79. 					{
  80. 						C[i][j] += array[i][k] * B.array[k][j];
  81. 					}
  82. 				}
  83. 			}
  84. 			return new Matrix(C);
  85. 		}
  86.  
  87. 		int[][] getArray ()
  88. 		{
  89. 			return array.clone();
  90. 		}
  91.  
  92. 		@Override
  93. 		public String toString ()
  94. 		{
  95. 			java.io.ByteArrayOutputStream buf 
  96. 				= new java.io.ByteArrayOutputStream();
  97. 			java.io.PrintStream out
  98. 				= new java.io.PrintStream(buf);
  99.  
  100. 			for (int[] line : array)
  101. 			{
  102. 				for (int value : line)
  103. 				{
  104. 					out.print(value + " ");
  105. 				}
  106. 				out.println();
  107. 			}
  108.  
  109. 			return buf.toString();
  110. 		}
  111.  
  112. 		static String toString (int[][] array)
  113. 		{
  114. 			if (Matrix.isMatrix(array) == false)
  115. 			{
  116. 				throw new java.lang.IllegalArgumentException("array");	
  117. 			}
  118. 			return new Matrix(array).toString();
  119. 		}
  120.  
  121. 		static Matrix valueOf (int[][] array)
  122. 		{
  123. 			if (Matrix.isMatrix(array) == false)
  124. 			{
  125. 				throw new java.lang.IllegalArgumentException("array");
  126. 			}
  127. 			return new Matrix(array.clone());
  128. 		}
  129. 	}
  130.  
  131. 	private static class MatrixException
  132. 		extends java.lang.Exception
  133. 	{
  134. 		MatrixException (String message)
  135. 		{
  136. 			super(message);
  137. 		}
  138. 	}
  139.  
  140. 	private static class NullArgumentException
  141. 		extends java.lang.IllegalArgumentException
  142. 	{
  143. 		NullArgumentException (String argname)
  144. 		{
  145. 			super(argname);
  146. 		}
  147. 	}
  148. }
Success #stdin #stdout 0.07s 381184KB
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https://ideone.com/Eq7t8Z
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
secret

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