Online C++ Compiler

#include <iostream> #include <math.h> using namespace std; long findXORSum(int arr[], int n) { long sum = 0; int unsetBits = 0, setBits = 0; for (int i = 0; i < 32; i++) { unsetBits = 0; setBits = 0; for (int j = 0; j < n; j++) { if (arr[j] % 2 == 0) unsetBits++; else setBits++; arr[j] /= 2; } sum += ( unsetBits*setBits* (pow(2,i)) ); } return sum; } int main() { int arr[] = { 5, 1, 4, 7, 9}; int n = sizeof(arr) / sizeof(arr[0]); cout<<"Sum of XOR of all pairs in an array is "<<findXORSum(arr, n); return 0; }