func_code_string: #include <bits/stdc++.h>   using namespace std;   bool hell(vector<int>& v1, vector<int>& v2) { return v1.size() < v2.size(); }   int main() {     int n;     cin >> n;     vector<vector<int> > f(100);     int a[2 * n + 1];     for (int i = 1; i <= 2 * n; i++) {       cin >> a[i];       f[a[i]].push_back(i);     }     int b[2 * n + 1];     int u = 1;     sort(f.begin() + 10, f.end(), hell);     for (int i = 10; i < 100; i++) {       for (int j = 0; j < f[i].size(); j++) {         b[f[i][j]] = u;         if (u == 1)           u = 2;         else           u = 1;       }     }     int u1 = 0, u2 = 0;     for (int i = 10; i < 100; i++) {       if (f[i].size() == 0) {         continue;       }       if (f[i].size() >= 2) {         u1++;         u2++;       } else {         if (b[f[i][0]] == 1) {           u1++;         } else           u2++;       }     }     cout << (u1 * u2) << endl;     for (int i = 1; i <= 2 * n; i++) {       cout << b[i] <<    ;     }     return 0;   }   