func_code_string: #include <bits/stdc++.h>   using namespace std;   template <typename S, typename T>   ostream &operator<<(ostream &os, pair<S, T> &m) {     os <<  [  << m.first <<     << m.second <<  ] ;     return os;   }   int n;   vector<int> v;   bool func(int k) {     int x = k - 1, y = n - 1;     for (int i = x; i >= 0; --i) {       if (2 * v[x] > v[y]) return false;       x--, y--;     }     return true;   }   int main() {     ios::sync_with_stdio(false);     cin.tie(0), cout.tie(0);     cin >> n;     v.resize(n);     for (int i = 0; i < n; ++i) cin >> v[i];     sort(begin(v), end(v));     int lo = 0, hi = n / 2, ans = 0;     while (lo <= hi) {       int mid = (lo + hi) / 2;       if (func(mid)) {         ans = mid;         lo = mid + 1;       } else         hi = mid - 1;     }     cout << n - ans << endl;     return 0;   }   