func_code_string: #include <bits/stdc++.h>   using namespace std;   clock_t T;   constexpr auto EPS = 1e-7;   const int mod = (int)1e9 + 7;   const double pi = acos(-1);   int dx[] = {0, 0, 1, -1, 1, 1, -1, -1};   int dy[] = {1, -1, 0, 0, 1, -1, 1, -1};   long long gcd(long long a, long long b) { return (a) ? gcd(b % a, a) : b; }   long long lcm(long long a, long long b) { return (a * b) / gcd(a, b); }   void COME_BACK() {     std::ios_base::sync_with_stdio(0);     cin.tie(NULL);     cout.tie(NULL);   }   int main() {     COME_BACK();     int n, x;     cin >> n >> x;     if (n == 2 && !x)       return cout <<  NO                    <<   n ,              0;     if (n == 1)       return cout <<  YES                    <<   n                    << x,              0;     if (n == 2)       return cout <<  YES                    <<   n                    << 0 <<     << x,              0;     cout <<  YES           <<   n ;     for (int i = 0; i < n - 3; i++) cout << i <<    , x ^= i;     cout << ((1 << 18) ^ x) <<     << (1 << 19) <<     << ((1 << 18) ^ (1 << 19))          <<   n ;   }   