func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long INF = 1e8;   const double EPS = 1e-9;   const long long MOD = (long long)(1e9 + 7);   const long long MAXV = (long long)(5e3 + 10);   const long long MAXE = (long long)(1e5 + 10);   int n, m;   int c[200];   vector<pair<int, int> > aux;   bool cmp(pair<int, int> a, pair<int, int> b) { return a.first > b.first; }   vector<int> L, R;   int main() {     cin >> n >> m;     for (int i = 0; i < n; i++) {       int a;       cin >> a;       c[a]++;     }     for (int i = 0; i <= 100; i++)       if (c[i]) aux.push_back(pair<int, int>(c[i], i));     sort(aux.begin(), aux.end(), cmp);     int r = aux[0].first;     for (int i = 0; i < aux.size(); i++)       for (int j = 0; j < aux[i].first; j++) L.push_back(aux[i].second);     R = L;     rotate(R.begin(), R.begin() + r, R.end());     int cnt = 0;     for (int i = 0; i < L.size(); i++)       if (L[i] != R[i]) cnt++;     cout << cnt <<   n ;     for (int i = 0; i < L.size(); i++) cout << L[i] <<     << R[i] <<   n ;     return 0;   }   