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  1. #include<bits/stdc++.h>
  2. #define pb push_back
  3. using namespace std;
  4. bool visited[200000]={false};
  5. int dfs(vector<vector<int> >&v,int i){
  6.     int maxi=0;
  7.     for(int j=0;j<v[i].size();j++){
  8.         if(!visited[v[i][j]]){
  9.         maxi=max(maxi,dfs(v,v[i][j])+1);
  10.         visited[v[i][j]]=!visited[v[i][j]];
  11.         }
  12.     }
  13.     return maxi;
  14. }
  15. bool visited2[200000]={false};
  16. int dist[200000]={0};
  17. void bfs(vector<vector<int> >&v,vector<vector<int> >&level){
  18.     queue<int> q;
  19.     q.push(0);
  20.     visited2[0]=!visited[0];
  21.     level[0].pb(0);
  22.     dist[0]=0;
  23.     int x;
  24.     while(q.size()){
  25.         x=q.front();
  26.         for(int i=0;i<v[x].size();i++){
  27.             if(!visited2[v[x][i]]){
  28.                 visited2[v[x][i]]=!visited2[v[x][i]];
  29.                 q.push(v[x][i]);
  30.                 dist[v[x][i]]=dist[x]+1;
  31.                 level[dist[x]+1].pb(v[x][i]);
  32.             }
  33.         }
  34.         q.pop();
  35.     }
  36. }
  37. int main(){
  38.     int n,q,i,x,y,j;
  39.     cin>>n>>q;
  40.     int a[n];
  41.     for(i=0;i<n;i++){
  42.         cin>>a[i];
  43.     }
  44.     vector<vector<int> > v(n);
  45.     for(i=0;i<n-1;i++){
  46.         cin>>x;
  47.         cin>>y;
  48.         v[x-1].pb(y-1);
  49.         //v[y-1].pb(x-1);
  50.     }
  51.     x=dfs(v,0);
  52.     vector<vector<int> > level(x+1);
  53.     bfs(v,level);
  54.     for(i=0;i<x+1;i++){
  55.         for(j=0;j<level[i].size();j++){
  56.             level[i][j]=a[level[i][j]];
  57.         }
  58.     }
  59.     for(i=0;i<x+1;i++){
  60.         sort(level[i].begin(),level[i].end());
  61.     }
  62.     int l;
  63.     while(q--){
  64.         cin>>l>>y;
  65.         l=l%(x+1);
  66.         int value=*lower_bound(level[l].begin(),level[l].end(),y);
  67.         if(value<y)
  68.         cout<<-1<<endl;
  69.         else cout<<value<<endl;
  70.     }
  71. }
  72.  
Runtime error #stdin #stdout 0.04s 17312KB
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https://ideone.com/x39j9v
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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