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  1. #include<bits/stdc++.h>
  2. using namespace std ;
  3. #define ll long long 
  4. #define faster() ios::sync_with_stdio(false); cin.tie(nullptr) ; cout.tie(nullptr);
  5. #define endl "\n"
  6.  
  7. void solve(){
  8.     int n  ; cin >> n  ;
  9.     vector<int> v(n - 1);
  10.     map<int,int> mp ;
  11.     for(int i = 0 ; i < n - 1 ; i++){
  12.         cin >> v[i];
  13.         mp[v[i]]++;
  14.     }
  15.     for(int i = 1 ; i <= n ; i++){
  16.         if(mp[i] == 0){
  17.             cout << i << endl;
  18.             return ;
  19.         }
  20.     }
  21. }
  22.  
  23. int main(){
  24.     faster();
  25.     int test ; cin >> test ;
  26.     while(test--){
  27.         solve();
  28.     }
  29.  
  30. }
Success #stdin #stdout 2.16s 5276KB
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https://ideone.com/lvTEd4
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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