Data Structure Array: Find the two numbers with odd occurrences in an unsorted array

http://www.geeksforgeeks.org/find-the-two-numbers-with-odd-occurences-in-an-unsorted-array/

#include <iostream>
#include <vector>
#include <algorithm>
#include <queue>
#include <stack>
#include <string>
#include <fstream>
#include <map>
using namespace std;

void printtwoodd(int arr[], int n) {
    int x = arr[0];
    for (int i = 1; i < n; i++) x ^= arr[i];
    x &= ~(x-1);
    int ans1, ans2;
    ans1 = ans2 = 0;
    for (int i = 0; i < n; i++) {
        if (arr[i] & x) ans1 ^= arr[i];
        else ans2 ^= arr[i];
    }
    cout << ans1 << " " << ans2 << endl;
}

int main() {
    int arr[8] = {4, 2, 4, 5, 2, 3, 3, 1};
    printtwoodd(arr, 8);
    return 0;
}