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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.  
  17.  
  18. class Solution {
  19.     static int subarrayXor(int[] arr, int k) {
  20.         int count = 0; // this will store our answer
  21.         HashMap<Integer, Integer> map = new HashMap<>(); // to store prefix XOR frequencies
  22.  
  23.         int prefixXor = 0; // XOR till current index
  24.  
  25.         for (int i = 0; i < arr.length; i++) {
  26.             // update the prefix xor
  27.             prefixXor = prefixXor ^ arr[i];
  28.  
  29.             // case 1: if prefix itself is equal to k
  30.             if (prefixXor == k) {
  31.                 count = count + 1;
  32.             }
  33.  
  34.             // case 2: check if we have seen prefixXor ^ k before
  35.             int check = prefixXor ^ k; // this is the required xor
  36.             if (map.containsKey(check)) {
  37.                 count = count + map.get(check); 
  38.             }
  39.  
  40.             // finally add this prefixXor into the map
  41.             if (map.containsKey(prefixXor)) {
  42.                 int old = map.get(prefixXor);
  43.                 map.put(prefixXor, old + 1);
  44.             } else {
  45.                 map.put(prefixXor, 1);
  46.             }
  47.         }
  48.  
  49.         return count;
  50.     }
  51.  
  52.     public static void main(String[] args) {
  53.         int[] arr = {4, 2, 2, 6, 4};
  54.         int k = 6;
  55.         int ans = subarrayXor(arr, k);
  56.         System.out.println("Total subarrays = " + ans);
  57.     }
  58. }
  59.  
Success #stdin #stdout 0.11s 54620KB
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https://ideone.com/5RpzJC
language:
Java (HotSpot 12)
created:
1 day ago
visibility:
public

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