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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[] nums=new int[n+1];
  16. 		int totalOneCount=0;
  17. 		for(int i=1;i<=n;i++){
  18. 			nums[i]=sc.nextInt();
  19. 			if(nums[i]==1) totalOneCount++; 
  20. 		}
  21. 		int k=sc.nextInt();
  22.         int zeros = 0;
  23.         for (int i = 0; i < k; i++) {
  24.             if (nums[i] == 0) zeros++;
  25.         }
  26.         int maxZeros = zeros;
  27.  
  28.         for (int i = k; i < n; i++) {
  29.             if (nums[i - k] == 0) zeros--;
  30.             if (nums[i] == 0) zeros++;
  31.             maxZeros = Math.max(maxZeros, zeros);
  32.         }
  33.         int y = k - maxZeros;
  34. 		int sum=y*(y+1)/2;
  35. 		int ans=sum+totalOneCount-y;
  36. 		System.out.println(ans);
  37.  
  38. 	}
  39. }
Success #stdin #stdout 0.14s 54668KB
comments (?)
stdin 
5 
1 1 1 0 1
4
stdout 
7
https://ideone.com/v5m9MU
language:
Java (HotSpot 12)
created:
8 days ago
visibility:
public

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