func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     vector<int> a(n + 1);     vector<int> b(n + 1);     for (int i = 1; i <= n; i++) cin >> a[i];     sort(a.begin() + 1, a.end());     for (int i = 1; i <= n / 2; i++) b[2 * i] = a[i];     for (int i = n / 2 + 1; i <= n; i++) b[(i - n / 2) * 2 - 1] = a[i];     int ans = 0;     for (int i = 2; i < n; i++) ans += (b[i] < b[i - 1]) * (b[i] < b[i + 1]);     cout << ans << endl;     for (auto i = b.begin() + 1; i != b.end(); i++) cout << *i <<    ;     cout << endl;   }   