func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 200005;   int n;   vector<int> adj[N];   vector<pair<int, int> > r;   int color[N];   bool vis[N];   void solve(int x) {     vis[x] = true;     for (auto w : adj[x]) {       if (!vis[w]) {         color[w] = (color[x]) ^ 1;         solve(w);       }     }   }   int32_t main() {     scanf( %d , &n);     for (int i = 0; i < n; i++) {       int x, y;       scanf( %d%d , &x, &y);       x--, y--;       adj[x].push_back(y);       adj[y].push_back(x);       int k = 2 * i;       int kk = 2 * i + 1;       k %= 2 * n;       kk %= 2 * n;       adj[k].push_back(kk);       adj[kk].push_back(k);       r.push_back(pair<int, int>(x, y));     }     for (int i = 0; i < 2 * n; i++) {       if (!vis[i]) {         solve(i);       }     }     for (auto w : r) {       cout << color[w.first] + 1 <<     << color[w.second] + 1 << endl;     }   }   