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  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. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		// your code goes here
  13. 		int[] a = {1, 10, 2, 5, 10, 1};
  14.  
  15. 		int n = a.length;
  16. 		int[] dp1 = new int[n];
  17. 		int[] dp2 = new int[n];
  18.  
  19.  
  20. 		for(int i = 0; i < n; i++){
  21. 			dp1[i] = 1;
  22. 			for(int j = i - 1; j >= 0; j--){
  23. 				if(a[j] < a[i]){
  24. 					dp1[i] = dp1[i] + dp1[j];
  25. 				}
  26. 			}
  27. 		}
  28.  
  29. 		for(int i = n-1; i >= 0; i--){
  30. 			dp2[i] = 1;
  31. 			for(int j = i + 1; j < n; j++){
  32. 				if(a[j] < a[i]){
  33. 					dp2[i] = dp2[i] + dp2[j];
  34. 				}
  35. 			}
  36. 		}
  37.  
  38. 		int count = 0;
  39. 		for(int i = 0; i < n; i++){
  40. 			count += (dp1[i] - 1 ) * (dp2[i] - 1);
  41. 		}
  42.  
  43. 		System.out.println(count);
  44.  
  45. 	}
  46. }
Success #stdin #stdout 0.07s 54628KB
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https://ideone.com/sBXZYQ
language:
Java (HotSpot 12)
created:
10 hours ago
visibility:
public

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