fork download
copy 
  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	static double p[][];
  11. 	static double dp[];
  12. 	static int n;
  13.  
  14. 	public static double f(int mask) {
  15. 		if (dp[mask] > -0.5)
  16. 			return dp[mask];
  17.  
  18.  
  19.  
  20. 		return dp[mask];
  21. 	}
  22.  
  23. 	public static void main(String[] args) throws NumberFormatException,
  24. 			IOException {
  25. 		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
  26. 		n = Integer.parseInt(bf.readLine());
  27. 		p = new double[n][n];
  28. 		for (int i = 0; i < n; i++) {
  29. 			StringTokenizer st = new StringTokenizer(bf.readLine());
  30. 			for (int j = 0; j < n; j++) {
  31. 				p[i][j] = Double.parseDouble(st.nextToken());
  32. 			}
  33. 		}
  34.  
  35. 		dp = new double[1 << n];
  36.  
  37. 		int limit = (1 << n);
  38. 		dp[limit - 1] = 1.;
  39.  
  40. 		int[] bitPairs = new int[n + 1];
  41. 		for (int bits = 0; bits <= n; ++bits) {
  42. 			bitPairs[bits] = bits * (bits + 1);
  43. 			bitPairs[bits] >>= 1;
  44. 		}
  45.  
  46. 		for (int mask = limit - 2; mask >= 0; --mask) {
  47. 			int bits = Integer.bitCount(mask);
  48. 			int pairs = bitPairs[bits];
  49.  
  50. 			for (int i = 0; i < n; i++) {
  51. 				if ((mask & (1 << i)) == 0) continue;
  52. 				for (int j = 0; j < n; j++) {
  53. 					if ((mask & (1 << j)) == 0)
  54. 						dp[mask] += dp[mask | (1 << j)] * p[i][j];
  55. 				}
  56. 			}
  57. 			dp[mask] /= pairs;
  58. 		}
  59.  
  60. 		for (int i = 0; i < n - 1; i++) {
  61. 			System.out.print(dp[1 << i] + " ");
  62. 		}
  63.  
  64. 		System.out.println(dp[1 << (n - 1)]);
  65.  
  66. 	}
  67. }
Success #stdin #stdout 0.1s 320256KB
comments (?)
stdin
copy 
5
0 1 1 1 1
0 0 0.5 0.5 0.5
0 0.5 0 0.5 0.5
0 0.5 0.5 0 0.5
0 0.5 0.5 0.5 0
stdout
copy 
1.0000000000000002 0.0 0.0 0.0 0.0
https://ideone.com/bIc4sh
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!