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  1. #include <iostream>
  2. #include <vector>
  3. #include <map>
  4. #include <string>
  5. #include <math.h>
  6. #include <set>
  7. #include <algorithm>
  8. #include <deque>
  9. #include <list>
  10. #include <bits/stdc++.h>
  11. #include <queue>
  12. using namespace std;
  13. #define ll long long
  14.  
  15. void solve(){
  16.     int m;
  17.     cin>>m;
  18.     vector<int>ans;
  19.     vector<vector<int>>ref(m, vector<int>());
  20.     for(int i=0; i<m; i++){
  21.         int n;
  22.         cin>>n;
  23.         for(int j=0; j<n; j++){
  24.             int x;
  25.             ref[i].push_back(x);
  26.         }
  27.     }
  28.     unordered_set<int>waste;
  29.     for(int i = m-1; i>=0; i--){
  30.         int flag = 0;
  31.         for(auto a: ref[i]){
  32.             if(!flag and waste.count(a)==0){
  33.                 flag = true;
  34.                 ans.push_back(a);
  35.             }
  36.             waste.insert(a);
  37.         }
  38.     }
  39.     if(ans.size()==m){
  40.         for(int i=m-1; i>=0; i--){
  41.             if(i==0){
  42.                 cout<<ans[i]<<endl;
  43.             }
  44.             else{
  45.                 cout<<ans[i]<<" ";
  46.             }
  47.         }
  48.     }
  49.     else{
  50.         cout<<-1<<endl;
  51.     }
  52. }
  53.  
  54. int main(){
  55.     int t;
  56.     cin>>t;
  57.     while(t--){
  58.         solve();
  59.     }
  60. }
Success #stdin #stdout 0.01s 5520KB
comments (?)
stdin 
3
3
4
1 2 4 8
3
2 9 1
2
1 4
2
2
1 2
2
2 1
4
4
1 2 3 4
1
1
1
4
1
3
stdout 
-1
-1
322621296
https://ideone.com/F1vSwk
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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