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  1. public class Matrix {
  2.  
  3.  
  4. 	static int N;	// size of the matrix
  5.  
  6. 	/**
  7. 	 * compute pow(base, pow)
  8. 	 * O(N^3) * logN
  9. 	**/
  10. 	static long[][] matrixPower(long [][] base, long pow)	{
  11. 		long [][] ans = new long [N][N];
  12. 		// generate identity matrix
  13. 		for (int i = 0; i < N; i++)	ans[i][i] = 1;
  14.  
  15. 		// binary exponentiation
  16. 		while ( pow != 0 )	{
  17. 			if	( (pow&1) != 0 )	ans = multiplyMatrix(ans, base);
  18.  
  19. 			base = multiplyMatrix(base, base);
  20.  
  21. 			pow >>= 1;
  22. 		}
  23.  
  24. 		return	ans;
  25. 	}
  26.  
  27. 	/**
  28. 	 * compute m * m2
  29. 	 * O(N^3)
  30. 	**/
  31. 	static long [][] multiplyMatrix(long [][] m, long [][] m2)	{
  32. 		long [][] ans = new long [N][N];
  33.  
  34. 		for (int i = 0; i < N; i++)	for (int j = 0; j < N; j++)	{
  35. 			ans[i][j] = 0;
  36. 			for (int k = 0; k < N; k++)	{
  37. 				ans[i][j] += m[i][k] * m2[k][j];
  38. 			}
  39. 		}
  40.  
  41. 		return	ans;
  42. 	}
  43.  
  44. }
Compilation error #stdin compilation error #stdout 0s 0KB
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Standard input is empty
compilation info 
Main.java:1: error: class Matrix is public, should be declared in a file named Matrix.java
public class Matrix {
       ^
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Standard output is empty
https://ideone.com/WiVoV0
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
secret

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