第十四届蓝桥杯省赛H题异或和之和

#include <iostream>

using namespace std;

const int N = 1E5 + 5;
int a[N];

int bit[N][21], cnt[2][21];

long long power(long long a, int b) {
   
    long long ret = 1;
    for (; b; b /= 2, a = a * a) {