func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 9e5 + 7;   const long long INF = 1e9 + 7;   int main() {     cout << 2000 << endl;     for (int i = 1; i <= 1000; i++) cout << i <<   1   << i <<   2 n ;     for (int i = 1000; i >= 1; i--) cout << i <<   1   << i <<   2 n ;     return 0;   }   