func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int test, i, j, count, flag = 0, n, o1 = 0, o2 = 0, b1, x, y, m, l,                                      z, max1, x1, y1, x2, y2, z1, k, sum, f, r,                                      ans1, min1;     cin >> n;     long long int a[n];     if (n == 1) {       cin >> x;       cout <<  1  n  << x;       return 0;     }     for (i = 0; i < n; i++) {       cin >> a[i];     }     sort(a, a + n);     vector<long long int> a1;     vector<long long int> a2;     flag = 0;     for (i = 0; i < n; i++) {       if (a1.size() == 0) {         a1.push_back(a[i]);       } else {         if (a2.size() == 0) {           a2.push_back(a[i]);         } else {           if (a2.back() != a[i]) {             a2.push_back(a[i]);           } else {             if (a1.back() != a[i]) {               a1.push_back(a[i]);             }           }         }       }     }     if (a1.size() >= 1 && a2.size() >= 1) {       if (a1.back() == a2.back()) {         a1.pop_back();       }     }     cout << a1.size() + a2.size() <<   n ;     for (i = 0; i < a1.size(); i++) {       cout << a1[i] <<    ;     }     for (i = a2.size() - 1; i >= 0; i--) {       cout << a2[i] <<    ;     }     return 0;   }   