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  1. #include <iostream>
  2. using namespace std;
  3. #include <vector>
  4. #include <algorithm>
  5.  
  6. vector<vector<int>> adj;
  7. void dfs1(int node,int pare,vector<int> &par,vector<vector<int>> &adj){
  8.     par[node]=pare;
  9.     for (auto it : adj[node]){
  10.         if (it!=pare){
  11.             dfs1(it,node,par,adj);
  12.  
  13.         }
  14.     }
  15. }
  16. void dfs2(int node,vector<vector<int>> &adj,int par,vector<int> &arr){
  17.     arr.push_back(node);
  18.  
  19.     for (auto it : adj[node]){
  20.         if (it!=par){
  21.             dfs2(it,adj,node,arr);
  22.  
  23.         }
  24.     }
  25.  
  26. }
  27. int main() {
  28.     int m;
  29.     cin>>m;
  30.     adj.resize(m+1);
  31.     for (int i=0;i<m-1;i++){
  32.         int u,v;
  33.         cin>>u>>v;
  34.         adj[u].push_back(v);
  35.         adj[v].push_back(u);
  36.  
  37.     }
  38.     for (int i=1;i<=m;i++){
  39.         sort(adj[i].begin(),adj[i].end());
  40.  
  41.     }
  42.  
  43.  
  44.  
  45.     vector<int> par(m+1);
  46.     dfs1(1,0,par,adj);
  47.  
  48.     int q;
  49.     cin>>q;
  50.     while (q>0){
  51.         int n;
  52.  
  53.         cin>>n;
  54.         int k;
  55.         cin>>k;
  56. 		vector<int> arr;
  57.         dfs2(n,adj,par[n],arr);
  58.         cout<<arr[k-1]<<endl;
  59.  
  60.         q--;
  61.  
  62.     }
  63.  
  64.  
  65.  
  66. 	return 0;
  67. }
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/3jTEjY
language:
C++14 (gcc 8.3)
created:
2 hours ago
visibility:
public

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