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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 arr[] = {1,2,3,4,5,6};
  14. 		int i = 0;
  15. 		int j = 5;
  16. 		int []prefixSum = calculatePrefix(arr);
  17. 		System.out.println("sum in range is "+ rangeSumQuery(i,j,prefixSum));
  18. 	}
  19. 	static int[] calculatePrefix(int[] arr){
  20. 		int[] res = new int[arr.length];
  21. 		int sum = 0;
  22. 		for(int i=0;i<arr.length;i++){
  23. 			sum+=arr[i];
  24. 			res[i] = sum;
  25. 		}
  26. 		return res;
  27. 	}
  28. 	static int rangeSumQuery( int i, int j, int[] prefixSum){
  29. 		int leftSum  = i>0?prefixSum[i-1]:0;
  30. 		int rightSum = j<prefixSum.length?prefixSum[j]:0;
  31. 		return rightSum-leftSum;
  32. 	}
  33. }
Success #stdin #stdout 0.16s 53460KB
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stdin
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Standard input is empty
stdout
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sum in range is 21
https://ideone.com/tgYoS4
language:
Java (HotSpot 12)
created:
14 hours ago
visibility:
public

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