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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. // Speed
  5. #define fast_io ios::sync_with_stdio(0); cin.tie(0); cout.tie(0)
  6.  
  7. // Typedefs
  8. #define int long long
  9. #define pb push_back
  10. #define ff first
  11. #define ss second
  12. #define all(x) (x).begin(), (x).end()
  13. #define rall(x) (x).rbegin(), (x).rend()
  14. #define sz(x) ((int)(x).size())
  15. #define endl '\n'
  16. #define yes cout << "yes\n"
  17. #define no cout << "no\n"
  18.  
  19. // Loops
  20. #define rep(i,a,b) for(int i=a;i<b;++i)
  21. #define per(i,a,b) for(int i=b-1;i>=a;--i)
  22. #define each(x, a) for (auto& x : a)
  23.  
  24. // Consts
  25. const int INF = 1e18;
  26. const int MOD = 676767677;
  27. const int N = 2e5 + 5;
  28.  
  29. // Math
  30. int gcd(int a, int b) { return b == 0 ? a : gcd(b, a % b); }
  31. int lcm(int a, int b) { return (a / gcd(a, b)) * b; }
  32.  
  33. int power(int a, int b, int m = MOD) {
  34.     int res = 1;
  35.     while (b > 0) {
  36.         if (b & 1) res = res * a % m;
  37.         a = a * a % m;
  38.         b >>= 1;
  39.     }
  40.     return res;
  41. }
  42.  
  43. int modinv(int a, int m = MOD) {
  44.     return power(a, m - 2, m);
  45. }
  46.  
  47. // Logic
  48. void solve() {
  49.     // Code
  50.     int n;
  51.     cin>>n;
  52.     vector<int> a(n);
  53.     int max1=0;
  54.     rep(i,0,n){
  55.     	cin>>a[i];
  56.     	max1=max(a[i],max1);
  57.     }
  58.     unordered_set<int> s(a.begin(), a.end());
  59.     int flag=0;
  60.     rep(i,5,n){
  61.     	if(s.count(i)==0) {
  62.     		flag=i;
  63.     		break;
  64.     	}
  65.     }
  66.     if(n<4){
  67.     	cout<<min(max1+1,4LL)<<endl;
  68.     }
  69.     else{
  70.     	if(flag==0) cout<<n<<endl;
  71.     	else cout<<flag<<endl;
  72.     }
  73.  
  74. }
  75.  
  76. // Main
  77. int32_t main() {
  78.     fast_io;
  79.  
  80.     int t;
  81.     cin >> t;
  82.     while (t--) {
  83.         solve();
  84.     }
  85.  
  86.     return 0;
  87. }
  88.  
Success #stdin #stdout 0s 5320KB
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stdout
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https://ideone.com/B8bTIZ
language:
C++ (gcc 8.3)
created:
20 hours ago
visibility:
public

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