func_code_string: #include <bits/stdc++.h>   using namespace std;   long long n, x, freq[100123], pairs = 0;   int main() {     ios_base::sync_with_stdio(0);     cin.tie(NULL);     cin >> n >> x;     long long v[n];     for (long long i = 0; i < n; i++) {       cin >> v[i];       freq[v[i]]++;     }     for (long long i = 0; i < 100123; i++)       if (freq[i] > 0)         if ((x ^ i) < 100123) pairs += freq[i] * (freq[(x ^ i)] - ((x ^ i) == i));     pairs /= 2;     cout << pairs << endl;     return 0;   }   