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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. 	}
  14. }
  15.  
  16. class GfG {
  17.     static int cntSubarrays(int[] arr, int k) {
  18.  
  19.         // HashMap to store prefix sums frequencies
  20.         Map<Integer, Integer> prefixmap = new HashMap<>();
  21.         int res = 0;
  22.         int currSum = 0;
  23.  
  24.         for (int i = 0; i < arr.length; i++) {
  25.             currSum += arr[i];
  26.  
  27.             if (currSum == k)
  28.                 res++;
  29.  
  30.             if (prefixmap.containsKey(currSum - k))
  31.                 res += prefixmap.get(currSum - k);
  32.             prefixmap.put(currSum, prefixmap.getOrDefault(currSum, 0) + 1); //will make a pair with every such occurance
  33.         }
  34.  
  35.         return res;
  36.     }
  37.  
  38. }
Success #stdin #stdout 0.11s 54616KB
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https://ideone.com/MicptZ
language:
Java (HotSpot 12)
created:
1 day ago
visibility:
public

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