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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. 		Scanner sc=new Scanner(System.in);
  14. 		int n=sc.nextInt();
  15. 		int a[]=new int[n];
  16. 		for(int i=0;i<n;i++) a[i]=sc.nextInt();
  17. 		int b[]=new int[n];
  18. 		for(int i=0;i<n;i++) b[i]=sc.nextInt();
  19. 		int dpa[][]=new int[n+1][2];
  20. 		int dpb[][]=new int[n+1][2];
  21. 		if(a[0]%2==0) dpa[1][0]=1;
  22. 		else dpa[1][1]=1;
  23.  
  24. 		if(b[0]%2==0) dpb[1][0]=1;
  25. 		else dpb[1][1]=1;
  26.  
  27. 		for(int i=2;i<=n;i++){
  28. 			if(a[i-1]%2==0){
  29. 				dpa[i][0]=dpa[i-1][0]+dpb[i-1][0];
  30. 				dpa[i][1]=dpa[i-1][1]+dpb[i-1][1];
  31. 			}else{
  32. 				dpa[i][0]=dpa[i-1][1]+dpb[i-1][1];
  33. 				dpa[i][1]=dpa[i-1][0]+dpb[i-1][0];
  34. 			}
  35.  
  36. 			if(b[i-1]%2==0){
  37. 				dpb[i][0]=dpb[i-1][0]+dpa[i-1][0];
  38. 				dpb[i][1]=dpb[i-1][1]+dpa[i-1][1];
  39. 			}else{
  40. 				dpb[i][0]=dpa[i-1][1]+dpb[i-1][1];
  41. 				dpb[i][1]=dpa[i-1][0]+dpb[i-1][0];
  42. 			}
  43. 		}
  44. 		System.out.println("Even number of ways: "+(dpa[n][0]+dpb[n][0]));
  45. 		System.out.println("Odd number of ways: "+(dpa[n][1]+dpb[n][1]));
  46. 	}
  47. }
Success #stdin #stdout 0.13s 58916KB
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stdin
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stdout
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Even number of ways: 4
Odd number of ways: 0
https://ideone.com/QaU3Sd
language:
Java (HotSpot 12)
created:
20 hours ago
visibility:
public

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