func_code_string: #include <bits/stdc++.h>   void solve() {     int n, z;     std::cin >> n >> z;     std::vector<int> xs(n);     for (auto& x : xs) std::cin >> x;     std::sort(xs.begin(), xs.end());     int ok = 0, ng = n / 2 + 1;     while (ng - ok > 1) {       int k = (ok + ng) / 2;       bool judge = true;       for (int i = 0; i < k; ++i) {         if (xs[n - k + i] - xs[i] < z) judge = false;       }       if (judge) {         ok = k;       } else {         ng = k;       }     }     std::cout << ok <<   n ;   }   int main() {     std::cin.tie(nullptr);     std::ios::sync_with_stdio(false);     solve();     return 0;   }   