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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 int cntSubarrays(int[] arr, int k) {
  11.         // code here
  12.         Map<Integer, Integer> freq = new HashMap<>();
  13.         int count = 0;
  14.         int prefixXor = 0;
  15.  
  16.         for (int num : arr) {
  17.             prefixXor ^= num;
  18.             if (prefixXor == k) {
  19.                 count++;
  20.             }
  21.             int required = prefixXor ^ k;
  22.             if (freq.containsKey(required)) {
  23.                 count += freq.get(required);
  24.             }
  25.  
  26.             freq.put(prefixXor, freq.getOrDefault(prefixXor, 0) + 1);
  27.         }
  28.  
  29.         return count;
  30.     }
  31.     public static void main(String [] args){
  32.         Scanner sc=new Scanner(System.in);
  33.         int n=sc.nextInt();
  34.         int [] arr=new int[n];
  35.         for(int i=0;i<n;i++){
  36.             arr[i]=sc.nextInt();
  37.         }
  38.         int k=sc.nextInt();
  39.         int cnt=cntSubarrays(arr,k);
  40.         System.out.println("Subarrays with given XOR "+k+" is : "+cnt);
  41.         sc.close();
  42.     }
  43. }
Success #stdin #stdout 0.19s 60760KB
comments (?)
stdin 
5
5 6 7 8 9
5
stdout 
Subarrays with given XOR 5 is : 2
https://ideone.com/ZotoYZ
language:
Java (HotSpot 12)
created:
3 days ago
visibility:
public

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