func_code_string: #include <bits/stdc++.h>   using namespace std;   struct Edge {     int src, dst;     int weight;     Edge(int src, int dst, int weight) : src(src), dst(dst), weight(weight) {}   };   bool operator<(const Edge &e, const Edge &f) {     return e.weight != f.weight ? e.weight > f.weight            : e.src != f.src     ? e.src < f.src                                 : e.dst < f.dst;   }   const int MAXN = 100000;   int main() {     int n;     cin >> n;     if (n % 2 == 0) {       cout << -1 << endl;     } else {       for (int i = 0; i < (int)n - 1; ++i) cout << i <<    ;       cout << n - 1 << endl;       for (int i = 0; i < (int)n - 1; ++i) cout << i + 1 <<    ;       cout << 0 << endl;       for (int i = 0; i < (int)n - 1; ++i) cout << (i + i + 1) % n <<    ;       cout << n - 1 << endl;     }     return 0;   }   