func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[111111];   map<int, int> cnt;   map<int, int> m;   int main() {     int n;     scanf( %d , &n);     m.clear();     cnt.clear();     for (int i = 0; i < n; i++) scanf( %d , &a[i]);     sort(a, a + n);     int ma = INT_MIN;     for (int i = 0; i < n; i++) {       m[a[i]] += 1;       ma = max(ma, a[i]);     }     vector<int> v;     for (int i = 0; i < n; i++)       if (cnt[a[i]] != 1) {         v.push_back(a[i]);         cnt[a[i]] = 1;         m[a[i]] = m[a[i]] - 1;       }     cnt.clear();     for (int i = n - 1; i >= 0; i--)       if (a[i] != ma && m[a[i]] > 0 && cnt[a[i]] != 1) {         v.push_back(a[i]);         cnt[a[i]] = 1;       }     printf( %d n , v.size());     for (int i = 0; i < v.size(); i++) printf( %d  , v[i]);     printf(  n );     return 0;   }   