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#include <queue> #include <iostream> #include <vector> #include <cstring> #include <iostream> #include <set> #include <cstring> #include <stack> #include <algorithm> #include <map> #include <cmath> //#include <bits/stdc++.h> using namespace std; typedef long long ll; const int maxn = 1e5 + 10; const ll INF = 3e16 + 10; const int max_point = 10000000; vector<int> graph[maxn]; void dfs(int node, int parent) { cout << node + 1 << endl; for(int i = 0; i < (int) graph[node].size(); i++) { int neighbour = graph[node][i]; if(neighbour != parent) { dfs(neighbour, node); } } } int main() { ios_base::sync_with_stdio(false); int n; cin >> n; for(int i = 0; i < n - 1; i++) { int a, b; cin >> a >> b; graph[a].push_back(b); graph[b].push_back(a); } dfs(0, -1); return 0; } /* 1: 10, 40 3: 20 **/
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