查找数组的前半部分和后半部分元素的XOR

给定大小为N的数组arr 。任务是找到数组的前一半( N / 2 )个元素和后一半( N – N / 2 )个元素的XOR。
例子：

Input: arr[]={20, 30, 50, 10, 55, 15, 42} 
Output: 56, 24 
Explanation: 
XOR of first half elements 20 ^ 30 ^ 50 is 56 
Xor of second half elements 10 ^ 55 ^ 15 ^ 42 is 24
Input: arr[]={50, 45, 36, 6, 8, 87} 
Output: 59, 89 
 

方法：

1. 将FirstHalfXOR和SecondHalfXOR初始化为0。
2. 在FirstHalfXOR中遍历数组和XOR元素，直到当前索引小于N / 2。
3. 否则，在SecondHalfXOR中使用XOR元素。

下面是上述方法的实现：

C++

// C++ program to find the xor of
// the first half elements and
// second half elements of an array
#include 
using namespace std;
 
// Function to find the xor of
// the first half elements and
// second half elements of an array
void XOROfElements(int arr[], int n){
 
    int FirstHalfXOR = 0;
    int SecondHalfXOR = 0;
 
    for(int i=0; i < n; i++){
         
        // xor of elements in FirstHalfXOR
        if (i < n / 2)
            FirstHalfXOR ^= arr[i];
 
        // xor of elements in SecondHalfXOR
        else
            SecondHalfXOR ^= arr[i];
    }   
    cout << FirstHalfXOR << "," << SecondHalfXOR << endl;
 
}
 
// Driver Code
int main() {
    int arr[] = {20, 30, 50, 10, 55, 15, 42};
 
    int N = sizeof(arr)/sizeof(arr[0]);
 
    // Function call
    XOROfElements(arr, N);
     
    return 0;
}
 
// This code is contributed by AnkitRai01

Java

// Java program to find the xor of
// the first half elements and
// second half elements of an array
 
class GFG{
 
// Function to find the xor of
// the first half elements and
// second half elements of an array
static void XOROfElements(int arr[], int n){
 
    int FirstHalfXOR = 0;
    int SecondHalfXOR = 0;
 
    for(int i = 0; i < n; i++){
         
        // xor of elements in FirstHalfXOR
        if (i < n / 2)
            FirstHalfXOR ^= arr[i];
 
        // xor of elements in SecondHalfXOR
        else
            SecondHalfXOR ^= arr[i];
    }
    System.out.print(FirstHalfXOR + ","
                     + SecondHalfXOR + "\n");
 
}
 
// Driver Code
public static void main(String[] args)
{
    int arr[] = { 20, 30, 50, 10, 55, 15, 42 };
 
    int N = arr.length;
 
    // Function call
    XOROfElements(arr, N);
     
}
}
 
// This code is contributed by 29AjayKumar

Python3

# Python3 program to find the xor of
# the first half elements and
# second half elements of an array
 
# Function to find the xor of
# the first half elements and
# second half elements of an array
def XOROfElements(arr, n):
 
    FirstHalfXOR = 0;
    SecondHalfXOR = 0;
 
    for i in range(n):
         
        # xor of elements in FirstHalfXOR
        if (i < n // 2):
            FirstHalfXOR ^= arr[i];
 
        # xor of elements in SecondHalfXOR
        else:
            SecondHalfXOR  ^= arr[i];
             
    print(FirstHalfXOR,",",SecondHalfXOR);
 
# Driver Code
arr = [20, 30, 50, 10, 55, 15, 42];
 
N = len(arr);
 
# Function call
XOROfElements(arr, N);

C#

// C# program to find the xor of
// the first half elements and
// second half elements of an array
using System;
 
class GFG{
 
// Function to find the xor of
// the first half elements and
// second half elements of an array
static void XOROfElements(int []arr, int n)
{
    int FirstHalfXOR = 0;
    int SecondHalfXOR = 0;
 
    for(int i = 0; i < n; i++)
    {
        
       // xor of elements in FirstHalfXOR
       if (i < n / 2)
           FirstHalfXOR ^= arr[i];
            
       // xor of elements in SecondHalfXOR
       else
           SecondHalfXOR ^= arr[i];
    }
     
    Console.Write(FirstHalfXOR + "," +
                  SecondHalfXOR + "\n");
}
 
// Driver Code
public static void Main(String[] args)
{
    int []arr = { 20, 30, 50, 10, 55, 15, 42 };
    int N = arr.Length;
 
    // Function call
    XOROfElements(arr, N);
}
}
 
// This code is contributed by 29AjayKumar

Javascript

 
// Javascript program to find the xor of
// the first half elements and
// second half elements of an array
 
    // Function to find the xor of
    // the first half elements and
    // second half elements of an array
    function XOROfElements(arr , n)
    {
 
        var FirstHalfXOR = 0;
        var SecondHalfXOR = 0;
 
        for (i = 0; i < n; i++) {
 
            // xor of elements in FirstHalfXOR
            if (i < parseInt(n / 2))
                FirstHalfXOR ^= arr[i];
 
            // xor of elements in SecondHalfXOR
            else
                SecondHalfXOR ^= arr[i];
        }
        document.write(
        FirstHalfXOR + ", " + SecondHalfXOR + "\n"
        );
 
    }
 
    // Driver Code
     
        var arr = [ 20, 30, 50, 10, 55, 15, 42 ];
 
        var N = arr.length;
 
        // Function call
        XOROfElements(arr, N);
 
 
// This code contributed by umadevi9616
 

输出：

56, 24

时间复杂度： O(N)